An engine oil leak may develop from the oil pump drive O-ring. This can often be confused with an intake manifold gasket leak. Careful inspection is required to determine the exact cause of the leak. Replacement of the failed 0-ring will commonly correct this concern.
Oil Pump Drive O-Ring May Leak Oil on Chevrolet Lumina
Average mileage: 123,500 (86,000–150,000)
Engines affected: 3.1L V6, 3.4L V6
11 people reported this problem
1993 Chevrolet Lumina - 3.1L V6 86,000 mi, Visitor
Thought at first it was the intake end gasket but actually it was the oil pump drive o-ring. Was able to pull up the drive shaft enough to clean and get some ultra copper gasket maker on the bottom of the shoulder of the shaft.
1995 Chevrolet Lumina - 3.1L V6 150,000 mi, Visitor
oil leaking from the o ring