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Joined: May 2016
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Campfire Kahuna
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Campfire Kahuna
Joined: May 2016
Posts: 60,426 Likes: 10 |
I am MAGA.
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Joined: May 2010
Posts: 7,359
Campfire Tracker
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Campfire Tracker
Joined: May 2010
Posts: 7,359 |
I used to add a quart of Rislone every 2 or 3 oil changes
"When the going gets weird, the weird turn pro."
Hunter S. Thompson
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Joined: Oct 2013
Posts: 18,926 Likes: 1
Campfire Ranger
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Campfire Ranger
Joined: Oct 2013
Posts: 18,926 Likes: 1 |
It probably won't hurt it, but I'd fill it with diesel and let soak for a good bit, then drain it. Let it drip for an hour or more. Then fill it with the right stuff. This is what I was thinking. If you don't want to use diesel put a qt of transmission fluid in there, let it sit a bit then drain. Fill with proper oil, let idle until up to temp then drain and start fresh.
Last edited by 10gaugemag; 03/17/24.
The last time that bear ate a lawyer he had the runs for 33 days!
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Joined: Feb 2013
Posts: 21,782 Likes: 7
Campfire Ranger
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Campfire Ranger
Joined: Feb 2013
Posts: 21,782 Likes: 7 |
Unless it is a modern engine that take 0W-16... You should be fine with a drain and refill.
Edit: My bad didn't read boat.
Last edited by CashisKing; 03/17/24.
If you are not actively engaging EVERY enemy you encounter... you are allowing another to fight for you... and that is cowardice... plain and simple.
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Joined: Jun 2016
Posts: 9,628
Campfire Outfitter
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Campfire Outfitter
Joined: Jun 2016
Posts: 9,628 |
Small engine have small delicate moving parts that may not like the added stress of thick oil. I'd just want to be sure I got a high percentage of it out of there before running.
A new 20 HP Merc is about $3600 BTW. No kidding, if a 20HP tiller handle long shaft Mercury can be had for that I will buy one. My net boat has been without a motor for over a year. It is 18 feet long and about 6 feet wide at the gunwales. Don't need to go fast, 10 or 15 MPH is fine
Last edited by gunzo; 03/17/24.
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Joined: Feb 2019
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Campfire Member
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Campfire Member
Joined: Feb 2019
Posts: 158 |
Why not call a Mercury dealer ?
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Joined: Dec 2002
Posts: 25,915 Likes: 2
Campfire Ranger
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Campfire Ranger
Joined: Dec 2002
Posts: 25,915 Likes: 2 |
Small engine have small delicate moving parts that may not like the added stress of thick oil. I'd just want to be sure I got a high percentage of it out of there before running.
A new 20 HP Merc is about $3600 BTW. No kidding, if a 20HP tiller handle long shaft Mercury can be had for that I will buy one. My net boat has been without a motor for over a year. It is 18 feet long and about 6 feet wide at the gunwales. Don't need to go fast, 10 or 15 MPH is fine Check these guys. Best prices I could find. Be careful, two or three years ago there was an almost identical scam website which demanded payment via cash app. https://www.cumberlandwatersports.com/Small Mercury engines are built in Japan by Tohatsu. Engines by either name are identical except for decals and price. I purchased the EFI, electric start, power tilt, 20 hp Tohatsu from them two years ago and was pleased with everything about the transaction. Tohatsu 2024 Tohatsu 20 HP MFS20EEFL 20hp Horsepower 106.0 lb Weight 20" (Long) Shaft Length $3,330.00 Mercury 2024 Mercury 20 HP EFI 20MLH 20hp Horsepower 107.0 lb Weight 20" (Long) Shaft Length $3,520.00
People who choose to brew up their own storms bitch loudest about the rain.
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Joined: Jan 2006
Posts: 69,383 Likes: 3
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2006
Posts: 69,383 Likes: 3 |
Small Mercury engines are built in Japan by Tohatsu. Mercury owns Tohatsu. Also, Nissan motors are just rebranded Tohatsu's. All parts are said to be interchangeable. I don't know if Merc, Tohatsu, and Nissan are all the same. I read that Honda also has some kind of arrangement with Tohatsu but I don't know if Hondas are made by them.
“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell
It's not over when you lose. It's over when you quit.
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Joined: Sep 2011
Posts: 60,856 Likes: 10
Campfire Kahuna
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Campfire Kahuna
Joined: Sep 2011
Posts: 60,856 Likes: 10 |
We bought a Merc, I don't know of a Tohmatsu dealer within a hundred miles of where we fish
These premises insured by a Sheltie in Training ,--- and Cooey.o
"May the Good Lord take a likin' to you"
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Joined: Oct 2007
Posts: 14,262
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2007
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Way back in the day, had a big block Plymouth that "used a little oil". Solution to slow the oil consumption was to put in 4 qts of straight 50W racing oil. Then top off with 90W gear grease. Cranked slow in cold weather. Otherwise zero ill effects. Old Hardleys leaked so bad we always ran straight 50 weight in them .
Its all right to be white!!
Stupidity left unattended will run rampant
Don't argue with stupid people, They will drag you down to their level and then win by experience
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Joined: Jun 2020
Posts: 1,806
Campfire Regular
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Campfire Regular
Joined: Jun 2020
Posts: 1,806 |
At which point did you realize you added gear oil instead of engine oil? Was it before or after it took 15 minutes for the bottle to drain?
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Joined: Jan 2023
Posts: 171
Campfire Member
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Campfire Member
Joined: Jan 2023
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Drain it. Plug it pour one quart of the correct oil in wait a few, drain it. Fill it, run it, forget about it. That gear oil won’t hurt a thing.
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Joined: Oct 2018
Posts: 148
Campfire Member
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Campfire Member
Joined: Oct 2018
Posts: 148 |
Jim Conrad’s question is in reference as to the additive that’s in oil packages. Some have adverse effects on yellow iron if you will. Hope he corrects me if I’m wrong in the assumption.
80W/90 gear oil has the same viscosity as straight 50 weight motor oil.
All that said I would drain, refill, run. Change oil again at half interval and then back on schedule.
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Joined: Sep 2004
Posts: 697
Campfire Regular
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Campfire Regular
Joined: Sep 2004
Posts: 697 |
I didn’t read the last couple of pages. I’d drain it. Throw some cheap 10-30wt and about 3/4 of a qt of diesel, let it idle to warm up good. Drain it, put your good oil and new filter in it and drive it.
Thanks, Billy
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Joined: Feb 2018
Posts: 10,142 Likes: 4
Campfire Outfitter
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Campfire Outfitter
Joined: Feb 2018
Posts: 10,142 Likes: 4 |
Not paying attention, I put 32oz of lower unit oil (80W-90) in my engine. (20hp Merc EFI outboard)
The motor capacity is 1.1 quart of engine oil....so I drained the gear lube out overnight. I also changed the filter beforehand but obviously didn't run the motor so it should be OK.
Any other precautions or is that enough?
MAGA! Nope, just fill according to the factory specs. Most the time that's fill it from the bottom, until lube comes out of the top hole, then screw in the top one and quickly put the drain screw in. I never measure mine, but some newer motors might have different requirements from to old type motors.
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Joined: Oct 2013
Posts: 18,926 Likes: 1
Campfire Ranger
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Campfire Ranger
Joined: Oct 2013
Posts: 18,926 Likes: 1 |
Not paying attention, I put 32oz of lower unit oil (80W-90) in my engine. (20hp Merc EFI outboard)
The motor capacity is 1.1 quart of engine oil....so I drained the gear lube out overnight. I also changed the filter beforehand but obviously didn't run the motor so it should be OK.
Any other precautions or is that enough?
MAGA! Nope, just fill according to the factory specs. Most the time that's fill it from the bottom, until lube comes out of the top hole, then screw in the top one and quickly put the drain screw in. I never measure mine, but some newer motors might have different requirements from to old type motors. That's for lower unit. He is talking about engine oil.
The last time that bear ate a lawyer he had the runs for 33 days!
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Joined: Oct 2005
Posts: 1,800
Campfire Regular
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Campfire Regular
Joined: Oct 2005
Posts: 1,800 |
drain it and fill it up with the right oil, a little gear oil won't hurt it. This but when you add the seafoam I'd top off with the correct oil. Run it a few minutes, then drain it again - overnight if you are anxious. Then refill with the correct oil and yer off to the races.... I run a number of motors ranging from 6hp 2 stroke to 250hp 4 stroke, so empathize....
Carry what you’re willing to fight with - Mackay Sagebrush
Perfect is the enemy of good enough
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Joined: Mar 2003
Posts: 2,578
Campfire Regular
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Campfire Regular
Joined: Mar 2003
Posts: 2,578 |
About a half a century ago a mechanic told me that 90w gear oil attacks brass. I don't know what the internal workings of a boat motor are like. Hence my Sea foam thought. Some solvent to get the gear oil out. Hope it works out for you OP.
NRA-Benefactor
TSRA-Life
"It's a terrible thing when governments send their young men to kill each other." Charles Byrne,WW2 Vet.
On the day Desert Storm began.
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Joined: Jan 2004
Posts: 4,579
Campfire Tracker
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Campfire Tracker
Joined: Jan 2004
Posts: 4,579 |
I quart of oil is cheap. Drain the heavy stuff, fill with one quart of oil, take out spark plug, spin it over several times, waiting a few minutes between each spin time to lessen stress on starter, drain, fill with new oil, put in spark plug, start, run until hot and drain again, change filter and add oil, run normal.
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