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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
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
15 people reported this problem
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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.