My 05 DeVille DHS loses oil! Not all of the time! The oil loss can be 3 to 4 qts at a time while driving. Any ideas of what I should look for? Filter and drain plug are not leaking.


Asked by Aug 31, 2015 at 11:32 AM about the 2005 Cadillac DeVille DHS Sedan FWD

Question type: Maintenance & Repair

5 Answers


Most likely it's the oil pressure sending unit. They're prone to leakage and failure. However, don't buy an aftermarket one. Get an AC Delco replacement. For some reason, aftermarket ones don't work correctly in these engines. HTH. -Jim

1 of 1 people found this helpful.

Thank you Mark. I will check that out. Do you know it's location please?

1 of 1 people found this helpful.

I am running the car now and looking underneath. I see a constant dripping of oil now that the motor is warm. Coming from the right passenger side of the motor. Close to where the main crank seal would be and belt and pulley's.

2 of 2 people found this helpful.

Sound,s like your front main seal is bad,not to bad to fix,just have to remove the harmonic balancer to replace.

1 of 1 people found this helpful.
Best Answer Mark helpful

It looks like I will need to get my technician with a hoist. Have him take a good look at it and check that out. Thank you all for your answers.

1 of 1 people found this helpful.

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