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.Google+
Car Problem Reports
Oldsmobile Alero Oil Pump Drive O-ring May Leak Oil From Rear of Engine
Oldsmobile Alero Problem
Engines Affected: 2.2L 4 Cylinder, 2.4L 4 Cylinder, 3.4L V6
Average Mileage: 165,500 mi (145,000 mi - 186,000 mi)
Visitor, 2001 Oldsmobile Alero, 2.4L 4 Cylinder, 186,000 mi
it was actually the oil pressure sensor that went badand shot out 2 quarts of oil in 4 minutes of driving.