Oil Leak From Lower Engine Area on Cadillac DeVille DTS

Problem Description and Possible Solution

The engine may develop an oil leak from the lower crankcase portion of the engine block. Our technicians tell us that the engine must be removed from the vehicle to properly repair this oil leak.

Problem Data
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Average mileage: 93,173 (110–174,000)
5 model years affected: 2001, 2002, 2003, 2004, more2005
53 people reported this problem
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Viewing 1 - 20 of 27 comments
Engine oil leak, engine seal gasket separate steel alloy casing from alumimun oil slump causing leak due to temp /expansion different . Known problem from GM engineers.
there is a trail of oil on my garage floor, and on my driveway. I have not done anything as of yet.
leak started one year ago/mid-engine/2500.00 repair/GM should absorb this cost due to known design flaw.
2002 DTS Oil leaks at bottom of crankcase. Cadillac missed the boat on this issue. I just top off oil to make sure it is full. Cadillac should recall for this problem.
Vehicle was repaired under Cadillac dealers warranty. Diagnosis in printout used the term "case halves," which were somehow sealed. The term "major engine" also appeared, which I interpret to mean the repair work was major in extent.
Mechanic could not locate specific location. It was either the oil filter adapter gasket or oil pan gasket. Had him replace adapter gasket first, cost $150.00. Now leak has expanded and his price for oil pan gasket repair is $1500.00/16hr labor at $80.00 hr. plus parts. Have appointment at different garage for second opinion.
I started using rear main oil sealant. It slow down the process hopefully it will stop it all together.I also went to a thicker oil.
Oil leak need to replace seal. Not worth expense.
Just occurred Solution in work once verified. A recent blog reads "Check PCV valve for clogs" before Rear Seal replacement... In Work.
Major Oil Leak Looks Like Leaking At The Back Of Engine Firewall
Dealer said engine had to be removed to fix the problem, oh and $4,000
OIL IS LEAKING AROUND REAR OF ENGINE AND OIL PAN, ENGINE NEEDS TO BE PULLED FOR REPAIR
Oil sending unit sensor went out which I replaced, but multiple oil leaks. Transmission problem and power windows off track.I will not buy another cadillac
Lower engine case leak... GM should have the good sense to repair the thousands of issues with this engine. Cadi owners should approach as a class action lawsuit to recover expense of this design flaw and expensive repair. If GM won't fix on their own merit class action lawsuits get many issues resolved in America. I mentioned this leak and the service writer immediately explained the cause and EXPENSE! Of the repair. Someone find an attorney, create a blog, and let's help GM do the right thing...
oil leak on left side of engine
Oil leak from lower engine area
My car leaks oil and cannot see where its coming from From this report I guess its the lower crankcase which is a very expensive repair to this car.We have a fleet of Cadillac cars and this is the first of my personal car.
My DHS has an oil leak that is getting progressively worst, I am currently using about 2 quarts of oil per month, the leak is seen on garage floor after parking it and during back-up into garage
not fixed at this time
Oil leaks on garage floor. Dealer said rear engine oil seal needed to be replace - cost $1,500.