Car Problem Reports

Buick Lucerne Engine Oil Leak From Front Crankshaft Seal

Buick Lucerne Problem
15 Reports
Me Too

Model Years Affected: 2006, 2009, 2010, 2011

Engines Affected: 3.9L V6, 4.6L V8

Average Mileage: 22,816 mi (2,500 mi - 81,000 mi)


An engine oil leak may develop from the front crankshaft seal. Our technicians tell us a revised front crankshaft seal is available to correct this concern.

  • Visitor, , 3.9L V6, 6,400 mi

    Oil leak between the front two wheels. Dealer replaced oil pan & gasket asm plus drain plug. Leaked again 1000 miles later - replaced drain plug again. Leaking again at 10,000 miles -- will take back to dealer. "Jerry" service manager says Buick has a problem with this engine. . . now it is my problem. . .going to take this to the next level.

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  • Visitor, , 3.9L V6, 59,580 mi

    Oil leak found at seal, dripping oil. Not very much. Engine oil shows full.
    Found engine not mounted properly when purchased. Found after replacing oil seal twice within first 6 months of ownership. Now the seal is leaking. Is this a factory defect. Of course its not long after the warranty is up.
    What can be done.

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  • Visitor, , 3.9L V6, 14,000 mi

    leaks since 8500 miles has been in to dealer now 7 times for the same problem, have
    replaced all gaskets , oil pan etc. I think the car is a lemon

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  • Visitor, , 3.9L V6, 6,000 mi

    oil leaks, has been taken in to correct 3 times
    dealer cannot seem to correct the problem

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  • Visitor, , 3.9L V6, 5,988 mi

    Front crank seal leaking oil...dripping on garage floor....seal replace by Buick dealer...part# 14090906...
    on 08 Jan 2011..

    Oil still leaking ....3-10-2014....Mileage...7816...'

    another trip scheduled to dealer for 3-11-2014.....

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  • Visitor, , 4.6L V8, 81,000 mi

    rear engine oil seal is leaking badly i just bought the car a week ago...

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  • Visitor, , 3.9L V6

    Timing belt cover leaked at 4000 miles and has been replaced 4 times total. Oil pan gasket at around 7000 miles head gasket leak(both) at around 15000 miles Retained attorney

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  • Visitor, , 3.9L V6, 34,000 mi

    Upon physically checking oil level in my 2010 Buick Lucerne 3.9L, V6 engine, with 25% oil life displyed on instrument panel between oil changes, none showed up on stick. Added a quart and level went to approximately 1/8 of an inch on stick...added another and it went to the mark just below the full mark. Took car to local dealer where car was purchased for an oil consumption test. I was told that there is an indication of an oil leak, but I assured the technician that there was no sign of oil leak on my cement garage floor. Changed oil and returned after 1,047 miles. Oil consuption test revealed .25/quart used and engine was again tested for an oil leak. Dye was added to oil and leak was observed at front of engine with a black light while engine was running. Crankshaft seal was replaced and was told that the problem was resolved. We shall see! Surely hope this new engine doesn't burn 2 quarts of oil in 4500 miles!

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  • Visitor, , 3.9L V6, 11,835 mi

    Mechanic noticed front of engine motor oil leak. DWill need to take to dealer to have timing cover oil seal replaced

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  • Visitor, , 3.9L V6, 30,500 mi

    2009 Buick Lucerne - Oil leak at 4000 miles, 4 trips to two dealers, gasket, oil pan and front main all replaced. Hope the improved front main seal will help on this 5th trip to the dealer. 30,500 miles now.

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