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10,000 mile Oil change intervals ? #15981396 04/10/21
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The new Tundra I have only spec’s doing oil changes with Synthetic every 10k...

For the First 10k I personally changed it at 3.5k, and 7k miles just as a precaution, now I’m thinking go to 5k miles per oil change for the next 10k...

But 10k between changes ? That’s a LONG time.

thoughts ?

BP-B2

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981457 04/10/21
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Im one of those that changes oil and filter every 5K even though my manual says 10K I prefer my oil to be carmel colored not black!

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981639 04/10/21
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I used to do anywhere from 3500 to 5000 mile oil changes on older vehicle until my 2013 tundra. It came with synthetic oil and recommended 10k changes - I drove it for 150k, 10k oil changes, sold it to my cousin last fall, it's still going strong, runs great, doesn't use any oil. My 2020 tundra I plan on pretty much the same.

I guess if you tow a lot or otherwise work the engine harder than "normal" shorter intervals might still make sense.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981647 04/10/21
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Unless you are doing a LOT of towing or a LOT of dusty roads, 10k miles is nothing for synthetic. The last two Land Cruisers I have had were bought new and I changed oil at 14-15k intervals... It still looked good and had no smell. First truck was sold at 342,000 miles with no problems and the last one has 363,000 with no problems. Your results may vary.

Dirt roads make up 5% of my driving and I tow nothing more than a john boat or a Polaris...

Last edited by Sasha_and_Abby; 04/10/21.

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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981657 04/10/21
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I have a 2008 4runner that has 250K miles on it. 10K between changes using Mobil 1 with new oil filter/ air filter and drive train greasing with Mystic high temp red grease. No issues.

IC-A

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981667 04/10/21
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My RAM diesel says every 15,000, but I stick to 10,000

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981709 04/10/21
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I also have a Ram diesel. I typically drive from 7500 to maybe 9000 miles a year so I just change it annually.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981728 04/10/21
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I changed my 07 tacoma every 10k w/ mobile1 when the manual required 5k intervals.

When the pickup was wrecked at 211k, I had just done an oil change, and when I checked the level prior to changing it it was right where it should be in the dipstick. Don’t use any oil that was detectable, just as expected

I also changed the tacoma (and now Tundra) at 1000-1500 for the first oil change.

I’m not convinced you will get any more life with 5k changes. Not that 211k is a lot, I think Seafire has a 22r with way over 500k on longer than 10k changes.


Sean
Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981785 04/10/21
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even though it's a PIA.......I'd at least change the filter @ 5K

Now the '06 Tacoma.......I know I would change the filter @ 5K

I like clean oil

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15981941 04/10/21
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Having been involved in fleet maintenance during my career, I'd remark on a couple things. Using the science of oil sampling, A filter does not clean the oil, it is only a suspended particulate trap.
Oil's life is determined by acid/ph balance, corrosive chemicals suspended in the oil created by condensation, cold starts and oxidation, and silicates from intake air (dust). Never change an air filter because it makes you feel virtuous. More silicates are introduced into the engine during filter changes than any other time. A typical highway service paper pleated, impregnated air filter doesn't begin to reach peak filtration until the 'filter minder' shows about 1/3rd restriction. SI engines (gasoline) usually are well within limits on oil contamination at 15 or 20,000 miles. Diesel engines can go much longer, almost indefinitely, when subjected to routine sampling. Eventually, diesel particulate load becomes a problem, and the oil needs to be changed, or in the case of industrial/marine units the oil will be centrifuged to reduce particulates in suspension. Most diesel fleets now are using fuel consumption formulae to determine oil changes after setting the standard with sampling. We overdo it to a ridiculous degree. But, this is not to start an argument, I'm merely pointing out what the industry standard is...you do what makes you happy.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15982341 04/10/21
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10,000 mile with synthetic oil shouldn’t be an issue as long as the crankcase is kept full.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15982426 04/10/21
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2002 tundra 4.7L almost due for its annual 10k oil change at 190,000. Mobil 1 synthetic, and unbelievably the oil still looks almost new.
Last winter tore down a 4.7 with 115,000+ miles and it was unbelievably clean, no sludge at all.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15983220 04/11/21
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my tacoma every 6 months or 5k with synthetic oil is cheap insurance

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15983288 04/11/21
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I'm pretty much a hard core old timer. I did switch to 5K changes on my 2004 Tacoma and when I had Dodge Diesel I went 1 a year and I typically put about 6K on it every year.

Now I have a 2019 Chevy Duramax with one of those computer oil life read outs on the LCD screen. It reads about 18% left when I have about 3K miles on it. I bought the 100K extended warranty on it when I bought the truck new as the cost was about the same as one injector pump and I had put 3 of them on my Dodge.
So the oil change is free for me.

I have never known too frequent oil changes to be detrimental to an engine,but dirty oil sure can be.I do a lot of driving on dirt roads an over 50 % of the driving is towing/hauling heavy loads


If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles
Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15983427 04/11/21
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I have an Equinox with the 2.4 four cylinder. I change that cars oil every 3500 miles or once a year with dexos rated synthetic. My gasoline truck is a 2003 and I change that oil every 4000 miles with Mobil 1. I think 10,000 is too far if you use your truck to tow or live in dusty conditions way out on gravel roads like I do.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15983501 04/11/21
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"10,000 mile oil change interval" written by the same company that wants to sell you another new vehicle.
My oil catch pan is an old white refrigerator vegetable crisper pan and the difference in the black sludge from my 3,000 mile old oil to my daughter's 5,000 mile old oil was significant. A product of combustion is carbon and that is harder than engine parts, so I suppose that I'm "wasting money" to get rid of the dirt by buying new oil and filters according to the manual. The only wear that I've ever seen on my vehicles is on the drain plug.


My other auto is a .45

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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15983639 04/11/21
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Originally Posted by Spotshooter

The new Tundra I have only spec’s doing oil changes with Synthetic every 10k...

For the First 10k I personally changed it at 3.5k, and 7k miles just as a precaution, now I’m thinking go to 5k miles per oil change for the next 10k...

But 10k between changes ? That’s a LONG time.

thoughts ?

There's only one way to know. Everything else is speculation.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15984027 04/11/21
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I have a 2005 F150 5.4 that I bought new. It has 234K miles and is still going strong. I change oil with Amsoil every 10K. I sent samples into Blackstone the first 8 oil changes. Always came back perfect- so I quit sending samples. Haven’t had one problem. 10K should be a breeze.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15984424 04/11/21
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15K intervals with Mobil One full synthetic with Mobil One filters here. Extensive research lead me to that decision. And that research mirrors what flintlocke posted. Toyota doesn’t want to sell you a new truck nearly as bad as they want your truck in the maintenance bay at their dealership every 2-3 months.

Last edited by chesterwy; 04/11/21.
Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15985452 04/11/21
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As mentioned, everything is just a guess unless you're doing used oil analysis' after every change. It's a small price to pay to know exactly how your oil is performing. Amsoil is what I use and is superb.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15985870 04/12/21
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Reminds me of barrel break in ideas lol. Mine is over 100,000 miles on 10 changes now. Runs great. My 4runner is due for its 10K change here shortly. Its at 60,000.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15985875 04/12/21
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10K interval on my 2008 Tacoma since new. Doesn't use any oil in between changes. 230K miles. Mobil1 oil and filter.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15986854 04/12/21
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On todays computer controlled engines, 10K is perfectly fine. There are many variables that go into determining your interval. Sump capacity is the biggest, also driving environment. If your sump holds 3.5 gallons, then you can go longer before your oil in contaminated. Oil doesn't "breakdown" or lose lubricating properties. Oil gets contaminated which can compromise it's lubricating properties. If you can keep it clean, you can run oil for 200K miles. How do you know if it is clean?? Not by looking at it, but by a lab doing an analysis on it. The cost of the analysis is about $35, so most people just change the oil, never knowing if it has silicon (dirt), fuel dilution, soot, coolant or other contaminants in it.
Once when I was bored to tears, I read how Detroit Diesel came up with a 15,000 change interval for their Series 60 engine. They put it under 100% load for 50% of the time and idled it for 50% of the time. Idling is not good for a diesel engine, and you have to go downhill sometime!!! My idle time is about 15% in winter and 7% in summer - I don't idle my truck. It is not at a 100% load all the time, I do go down hills too. I pull a sample at 15K and send it in. If it is good I keep going. I do change the filters at 30K as I have no way to tell if they are getting clogged. Because my engine has some age on it and a performance tune, I usually only get 45K-60K out of my oil. When I only had 200K - 400K on the engine, I once went for 186K on the same oil. The analysis came back good, but I changed it anyway.
All this means is that if everything is good, 10K is not a big deal in a gas 4L-7L engine. What it doesn't mean is that it will always be good. If you are sucking in unfiltered air and don't know it. You are doing damage going to 10K. If your headgasket is starting to fail and coolant is contaminating your oil, a 2K oil change interval isn't enough to keep damage from happening. If you have a performance chip and one of your injectors is starting to drip, in 3K your oil could be diluted enough that the viscosity is down to 2 or 3 weight oil!! All of the above problems can be detected on an oil analysis before major damage happens. Currently my Series 60 is producing 2.3% soot at 15,000 miles (over 2% is an issue). It could be the performance tune combined with a weak injector - which is an expensive fix. Or it could be the valves slightly out of adjustment. I will run the overhead and look at the next analysis. If it goes down or is only slightly higher - problem solved. If it is around 5% then it is time to change the oil and correct the problem (more than likely an injector).
I don't recommend you do an analysis on your Toyota every 10K, but I would certainly do one every 25K. Amsoil sells kits, Caterpillar has kits and Horizon labs can get you kits. All are good labs. Avoid benchtop instant analysis at a truck lube or truck stop. Bad information is worse than no information.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15991117 04/13/21
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Modern engines, modern oils. 10K is fine. If you have doubts, Blackstone.
Oil and engines have come a long way since the 60s, but, Daddy did it every 3K back then, so...

I don't mind wasting money, but I'd rather waste it on a good steak.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15992454 04/14/21
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True that my 3K oil changing mentality is coming out of the "76 F-150 carburetor engine '70's when I did send in my 10,000 mile oil Amsoil in for an oil analysis and it came back as 10% fuel dilution, a totally depleted lubrication package with metal particles and with a note to get rid of it ASAP. Never again Amsoil and never again 10K oil changes. Early Mobil 1 in my Saab 99 I figured didn't lubricate the turbo seals and two turbos later never again Mobil 1 either. Then I'm remembering a phone call from one of our East coast sales guys who was taking his company car in for a new engine rebuild after he had been "saving time" on oil changes by running his oil 25,000 miles.


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Re: 10,000 mile Oil change intervals ? [Re: Windfall] #15992649 04/14/21
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Originally Posted by Windfall
"10,000 mile oil change interval" written by the same company that wants to sell you another new vehicle.


How many people do you know that have ever worn out a Toyota engine?

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15992931 04/14/21
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Engine problems are more rare nowadays than ever before, no matter the make.


It is irrelevant what you think. What matters is the TRUTH.
Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15994482 04/14/21
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Almost all modern engines are gasoline direct injected (GDI) and a lot of them are turbocharged. Honda CRV 1.5L is a good example, so are Ford Ecoboost engines. These engines are well known for fuel contamination in the oil, especially when driven for short trips where the engine doesn't get fully warmed up. Over a 10,000 mile interval you could easily end up with a quart or more of gasoline in your crankcase. Personally, I would never exceed 5,000 miles on any GDI turbo engine. Smell the oil on one sometime.

Re: 10,000 mile Oil change intervals ? [Re: JGRaider] #15994943 04/15/21
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Originally Posted by JGRaider
Engine problems are more rare nowadays than ever before, no matter the make.
Back in the 70's and before, an engine was pretty well worn out at 100k.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15995082 04/15/21
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back in the day, 100,00 miles was about time to start putting some STP in the engine oil. Or at least that's what my dad did. Sure got rid of any ticking coming from the engine.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #15997788 04/15/21
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10K is easier than ever. The quality of oil now, plus much tighter tolerances on engine builds allows it.


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Re: 10,000 mile Oil change intervals ? [Re: TRnCO] #15997928 04/16/21
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Originally Posted by TRnCO
back in the day, 100,00 miles was about time to start putting some STP in the engine oil. Or at least that's what my dad did. Sure got rid of any ticking coming from the engine.



Yeah. You pull the valve covers on an engine in the 70s with 100K on it that had oil changed ever 3K and the sludge and build up was impressive. Pull the valve covers on an engine today with 100K that had 10K oil changes with synthetic and it's night and day difference. People aren't wearing out engines.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16005610 04/18/21
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My new Dodge is 10,000 miles. I change my 2004 every 4000 miles, probably over kill. I change my 89 jeep every 3000 miles.

Re: 10,000 mile Oil change intervals ? [Re: Cowboybart] #16005891 04/18/21
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Originally Posted by Cowboybart
On todays computer controlled engines, 10K is perfectly fine. There are many variables that go into determining your interval. Sump capacity is the biggest, also driving environment. If your sump holds 3.5 gallons, then you can go longer before your oil in contaminated. Oil doesn't "breakdown" or lose lubricating properties. Oil gets contaminated which can compromise it's lubricating properties. If you can keep it clean, you can run oil for 200K miles. How do you know if it is clean?? Not by looking at it, but by a lab doing an analysis on it. The cost of the analysis is about $35, so most people just change the oil, never knowing if it has silicon (dirt), fuel dilution, soot, coolant or other contaminants in it.
Once when I was bored to tears, I read how Detroit Diesel came up with a 15,000 change interval for their Series 60 engine. They put it under 100% load for 50% of the time and idled it for 50% of the time. Idling is not good for a diesel engine, and you have to go downhill sometime!!! My idle time is about 15% in winter and 7% in summer - I don't idle my truck. It is not at a 100% load all the time, I do go down hills too. I pull a sample at 15K and send it in. If it is good I keep going. I do change the filters at 30K as I have no way to tell if they are getting clogged. Because my engine has some age on it and a performance tune, I usually only get 45K-60K out of my oil. When I only had 200K - 400K on the engine, I once went for 186K on the same oil. The analysis came back good, but I changed it anyway.
All this means is that if everything is good, 10K is not a big deal in a gas 4L-7L engine. What it doesn't mean is that it will always be good. If you are sucking in unfiltered air and don't know it. You are doing damage going to 10K. If your headgasket is starting to fail and coolant is contaminating your oil, a 2K oil change interval isn't enough to keep damage from happening. If you have a performance chip and one of your injectors is starting to drip, in 3K your oil could be diluted enough that the viscosity is down to 2 or 3 weight oil!! All of the above problems can be detected on an oil analysis before major damage happens. Currently my Series 60 is producing 2.3% soot at 15,000 miles (over 2% is an issue). It could be the performance tune combined with a weak injector - which is an expensive fix. Or it could be the valves slightly out of adjustment. I will run the overhead and look at the next analysis. If it goes down or is only slightly higher - problem solved. If it is around 5% then it is time to change the oil and correct the problem (more than likely an injector).
I don't recommend you do an analysis on your Toyota every 10K, but I would certainly do one every 25K. Amsoil sells kits, Caterpillar has kits and Horizon labs can get you kits. All are good labs. Avoid benchtop instant analysis at a truck lube or truck stop. Bad information is worse than no information.



Like this man said. If your engine is leaking air, gas or anti freeze, you will need to change it every 1000 miles. If your engine is right, you can go a long ways before an oil change. I have gone 46K and then 39K between oil changes with Amsoil , filter every 15K anf oil test every 15K. The oil always came back good , even after 46K. I did this 10 yrs ago and still have the engine with 282,000 mi. and it burns about 1qt per 10,000 mi. I dont use Amsoil anymore cause Shell Rotella T6 is everywhere and its $40 for a 10 qt. jug on super sale. Now I chenge about every 12,000 mi. but I am going to get an oil test after 10K . Not to see if the oil is good, but to see if I am leaking diesel, anti freeze or dirty air.


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16005999 04/18/21
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Because my idiot light say "change oil", my 2019 Duramx gets changed at about 3000 miles.Not doing so,voids my 100K warranty. Plus it's free


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Re: 10,000 mile Oil change intervals ? [Re: saddlesore] #16013864 04/20/21
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Originally Posted by saddlesore
Because my idiot light say "change oil", my 2019 Duramx gets changed at about 3000 miles.Not doing so,voids my 100K warranty. Plus it's free


The duramax only gets 3000 miles before the change oil is advised??? Wow. Even the "severe service" interval on most modern diesels is more than twice that long. You might want to get the idiot light checked

Last edited by tx270; 04/20/21.
Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16013896 04/20/21
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My 2011 D-max would get almost 10k between oil changes going off of the OLM.

Re: 10,000 mile Oil change intervals ? [Re: tx270] #16014616 04/21/21
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Originally Posted by tx270
Originally Posted by saddlesore
Because my idiot light say "change oil", my 2019 Duramx gets changed at about 3000 miles.Not doing so,voids my 100K warranty. Plus it's free


The duramax only gets 3000 miles before the change oil is advised??? Wow. Even the "severe service" interval on most modern diesels is more than twice that long. You might want to get the idiot light checked


It's the computer read out on the LCD.Doesn't bother me,I have the extended warranty and they are free.Clean oil has never been a detriment to any engine


If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles
Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16016044 04/21/21
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I got a good laugh when I took my 2020 Silverado in for its first oil change which was complimentary, whoever changed the oil put the next oil change was due in 3K miles. I didn’t know my dad for father in-law (both mechanics) were still alive. Both of those men believed in 3K oil changes and they never met each other ever I their life.

Re: 10,000 mile Oil change intervals ? [Re: Hudge] #16017207 04/21/21
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Originally Posted by Hudge
I got a good laugh when I took my 2020 Silverado in for its first oil change which was complimentary, whoever changed the oil put the next oil change was due in 3K miles. I didn’t know my dad for father in-law (both mechanics) were still alive. Both of those men believed in 3K oil changes and they never met each other ever I their life.

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Re: 10,000 mile Oil change intervals ? [Re: Hudge] #16017306 04/21/21
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Originally Posted by Hudge
I got a good laugh when I took my 2020 Silverado in for its first oil change which was complimentary, whoever changed the oil put the next oil change was due in 3K miles. I didn’t know my dad for father in-law (both mechanics) were still alive. Both of those men believed in 3K oil changes and they never met each other ever I their life.



When I took my pick-up in for its first oil change they put either 3000 or 5000 mile schedule on it. I reminded them the manual says 15,000 (I bought it from this dealership.) The mechanic gave me an excuse of "we can't change our computer to print 15,000." He said it would be ok to go 15,000. Since I had it under warranty I keep it at 10,000 so I don't go over.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16017376 04/22/21
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My 7.3L PSD does 10K no problem. I've have had Blackstone test it at 5K, they said add 3K more, tested again at 8K, and it was still good to go. This is an engine that uses the oil as hydraulic means to actuate the injectors with up to 3000 PSI oil pressure, so it wears the oil much faster than engines that only use it for lubrication. I'm sure every modern made vehicle can do 10K OCI with modern oils if this dinosaur can.

I had a 3.4L Tacoma before this and ran high quality oil usually Mobil 1 or Amsoil depending on availability, and I got to a point that I was only changing once per year because the oil was still amber coloured, but at the time I heard that oil should be changed yearly at the max because the oil will become acidic. It was usually 14-18K miles at a year, and while I never did an OA on it it's still in the family with nearly 220K miles and it's been with us since 40K, and still running strong/clean. If that truck was 4x4 and could tow more than 5K it'd still be mine.


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Re: 10,000 mile Oil change intervals ? [Re: Windfall] #16079306 05/12/21
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Originally Posted by Windfall
"10,000 mile oil change interval" written by the same company that wants to sell you another new vehicle.
.



So the engine pukes due to 10k mile OCIs , at a mileage that most of us would deem unacceptable, let’s say 80k miles. Are you really gonna buy another truck from that manufacturer after only getting 80k miles out of their engine?

The whole they want to sell you another truck theory doesn’t make much sense to me.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16080646 05/13/21
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When I worked for a large trucking company - at the time the manufacturer said 10k OCI

We determined, working with the oil company, that OCI could be 100k+ if you swapped filters at 25-30k - we went 75k OCI to be "safe"

For reference - we had deals with that same manufacturer for VERY generous warranty and even if it wasn't warranty - our pricing was such that overhauls were about 1/5 the street price - parts and labor included no matter what dealer did the work or if we did it in our shops. They were ok with it.

Of the 4 years I worked in that department - I can't remember a single instance where we had major component failure due to oil condition. Failures happened mostly due to lack of oil (skipped PM cycles or failure some other way).

Unlikely a manufacturer is telling you to extend OCI so they can sell you another one soon.


Me

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16093387 05/18/21
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I have been using Mobil extended performance oil with a Mobil 1 extended life filter on my 2012 Tacoma 4.0L for years. It now has 175k trouble free miles. I have had used oil analysis down on it several times and it always tests out great. I could run it easily another 5k miles. As someone else pointed out unless your doing UOA your just guessing.

Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16093989 05/18/21
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Mobil 1, and filter at 10,000 miles.


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Re: 10,000 mile Oil change intervals ? [Re: Windfall] #16171995 06/14/21
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Originally Posted by Windfall
True that my 3K oil changing mentality is coming out of the "76 F-150 carburetor engine '70's when I did send in my 10,000 mile oil Amsoil in for an oil analysis and it came back as 10% fuel dilution, a totally depleted lubrication package with metal particles and with a note to get rid of it ASAP. Never again Amsoil and never again 10K oil changes.


You can't blame Amsoil for an incorrectly running engine. 1976 carbureted engine ... really?? Can you tell me that nothing has changed in the last 35 years!!


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Re: 10,000 mile Oil change intervals ? [Re: Cowboybart] #16172907 06/15/21
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Originally Posted by Cowboybart
Originally Posted by Windfall
True that my 3K oil changing mentality is coming out of the "76 F-150 carburetor engine '70's when I did send in my 10,000 mile oil Amsoil in for an oil analysis and it came back as 10% fuel dilution, a totally depleted lubrication package with metal particles and with a note to get rid of it ASAP. Never again Amsoil and never again 10K oil changes.


You can't blame Amsoil for an incorrectly running engine. 1976 carbureted engine ... really?? Can you tell me that nothing has changed in the last 35 years!!


Okay, point taken, but back then Amsoil was a diester based oil (what ever that means) and I had their gear lube in the transfer case and differentials and it ate the seals and leaked in the driveway. That coupled with the cold weather automatic choke and carburetor engines of the day, the bad oil analysis I got and the scarcity of an Amsoil dealer... There were other better choices. I used Mobil One in my turbo Saab too and that oil didn't stand up to the heat in the turbo seals, so I don't use that anymore either. Zero issues with Castrol ever since in anything with more frequent changes, so I suppose after reading through this thread that I'm wasting money by changing more frequently, but those expensive early engine issues stay with a guy.


My other auto is a .45

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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16176070 06/16/21
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Windfall, calling BS on the Amsoil problems. I've been using it for a few years now and have run used oil analysis at least every other oil change. Post up the results from your oil analysis if you don't mind to show us how bad Amsoil is, or how great Mobil One is, etc.


It is irrelevant what you think. What matters is the TRUTH.
Re: 10,000 mile Oil change intervals ? [Re: Windfall] #16176109 06/16/21
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Originally Posted by Windfall
Originally Posted by Cowboybart
Originally Posted by Windfall
True that my 3K oil changing mentality is coming out of the "76 F-150 carburetor engine '70's when I did send in my 10,000 mile oil Amsoil in for an oil analysis and it came back as 10% fuel dilution, a totally depleted lubrication package with metal particles and with a note to get rid of it ASAP. Never again Amsoil and never again 10K oil changes.


You can't blame Amsoil for an incorrectly running engine. 1976 carbureted engine ... really?? Can you tell me that nothing has changed in the last 35 years!!


Okay, point taken, but back then Amsoil was a diester based oil (what ever that means) and I had their gear lube in the transfer case and differentials and it ate the seals and leaked in the driveway. That coupled with the cold weather automatic choke and carburetor engines of the day, the bad oil analysis I got and the scarcity of an Amsoil dealer... There were other better choices. I used Mobil One in my turbo Saab too and that oil didn't stand up to the heat in the turbo seals, so I don't use that anymore either. Zero issues with Castrol ever since in anything with more frequent changes, so I suppose after reading through this thread that I'm wasting money by changing more frequently, but those expensive early engine issues stay with a guy.

How many miles on said vehicles before switching to Amsoil?


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Re: 10,000 mile Oil change intervals ? [Re: Spotshooter] #16188488 12 hours ago
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Geez you guys, at my age I don’t remember what I did last weekend let alone what I was doing with my ‘76 F-150 forty years ago. That one was broken in with maybe 40 thousand on it as I never kept anything much over a hundred thousand back in those days. Now I just get rid of the “old” oil at way less than 10,000 miles. Amsoil I’m sure has changed their formulations some since I used it and I know that the Mobil 1 oil that gave me trouble in the Saab has been made much thicker since it first came out when I used it.


My other auto is a .45

The bitterness of poor quality is remembered long after the sweetness of low price has faded from memory
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