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.
Car Problem Reports
Chevrolet Venture Oil Pump Drive O-ring May Leak Oil From Rear of Engine
Chevrolet Venture Problem
Engine Affected: 3.4L V6
Average Mileage: 118,000 mi (80,000 mi - 156,000 mi)