Car Problem Reports

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

Buick Century Problem
14 Reports
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Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005

Engine Affected: 3.1L V6

Average Mileage: 143,000 mi (115,000 mi - 171,000 mi)


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.

  • Visitor, , 3.1L V6, 171,000 mi

    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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