Archived Low Oil Pressure

[JEverett]

17k miles on 2005 3500. Oil pressure reads 40+ on initial startup. After warmup, pressure drops to 20 at idle and doesn't return to 40 until over 1500rpm. Just started doing this past week. Took it back to Dodge dealer and they said the factory specs were 10psi at idle-30psi at 2500rpm. Bull..... 10psi is in the middle of the "red" zone on the factory oil guage. It has always read 40-50psi until last week when the dealer changed the oil!! Any thoughts?

 

[p-Bar]

The factory gauge is a piece of junk. It's a step above the idiot light. Thew dealer can program it to read anything you would like which they have done in cases. If you are worried I would put a mechanical gauge on to see wher you stand. Their was a long thread on this subject I will try post it when I find it. Her it is



https://www.turbodieselregister.com/forums/showthread.php?t=98962&highlight=oil+guage

 

[JEverett]

Thanks for the reply link. I'll put a mechanical guage on it and see what it says. I got concerned when it was always reading 40-55psi and then suddenly started reading low after warmup. What is the normal range I should see with a mechanical guage? I still can't believe the Dealer said 10-30psi!!

 

[p-Bar]

You may want to contact Cummins or a Cummins repair facility . Make reference to Cummins ISB that is the model motor for the Dodge. Let us know what they say.



Don

 

[Nightram]

Unfortunately, what the dealer said is true, per the factory service manual on alldata, the specs at idle are minimum of 10 psi oil pressure.

 

[bavrit]

You could have a bad oil filter! You said it started with an oil change? I would change oil and filter!