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I have a 1998 Dodge 2500 with a Cummins diesel. After a foray in the Blue Mountains this last week-end when pulling into my driveway the oil pressure light came on. The oil pressure gauge read "O". A light touch of the throttle got a pressure reading but when an idle resumed it dropped again. I use Shaefer synthetic oil. My last change was for a racing grade multi-vis oil. It had about 6000 miles at this time. Although unlikely I thought the oil might have lost it's viscosity and had the oil changed to Schafer's Supreme 9000 5W-40. It still has the same problem. The engine is operating in the cool range according to the temp gauge.
My question(s) is:
Has anyone here experienced the same problem?
Could it be a defective oil pressure gauge or sending unit?
Could it be a more serious and expensive problem?
Thanks in advance for replies
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If I'm not mistaken, the oil pressure gauge is electronic and gets its reading from the ECM (that is if you have a 24v Cummins and not a 12v)
It could be a bad unit. What does the oil look like? Good color?
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The 1998 Dodge with the Cummins has the electronically controlled auto transmission but the engine is still mechanically controlled, I am assuming it's 12V I could very well be wrong. The oil color looks fine. Detergent oil give the engine a pretty good douche so it appears to carry a lot of stuff.
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Put a mechanical pressure gauge on it and see what it reads. If that reads ok it's probably the oil pressure sending unit.
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Thanks for the replies. I'm taking the rig in to my BIL's old shop and go with the mechanical reading of the oil pressure. Hopefully it'll just show I need a new sending unit.
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Pretty sure it's 12. My '98 is the last 12 valve.
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Pretty sure it's 12. My '98 is the last 12 valve. They made both in 98, thats why was asking
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It will say " 24 valve Cummins Turbo Diesel" in orange letters under the emblem on the door. If it just says "Cummins Turbo Diesel" it is a 12v.
To play the game, you first gotta have game. - Ike Turner
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