Oil Pump Drive O-ring May Leak Oil From Rear of Engine on Buick Century

An engine oil leak may develop from the rear of the engine. This is commonly caused by a failed oil pump drive o-ring seal. The leaking o-ring should be replaced to correct this concern.

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Average mileage: 143,000 (115,000–171,000)
Engine affected: 3.1L V6
12 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
14 people reported this problem
1 person shared problem details
2002 Buick Century- 3.1L V6171,000
Engine leaking quart of oil every 300 miles. Big O Auto repair said oil pump O-ring seal needed replaced. Cost estimated at $450.00 (mostly labor). Technician had seen this problem many times before on GM 3.1 engines.
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