GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual

Excessive Oil Leakage


When large amounts of oil are noticed under the engine after each operation, check for the following, as necessary:

Damaged or broken oil filter gasket.
Leaking oil pressure sending switch.
Worn rear main oil seal gasket.
Worn front main oil seal gasket.
Damaged or broken fuel pump gasket (mechanical pump).
Damaged or loose valve cover gasket.
Damaged oil pan gasket or bent oil pan.
Improperly seated oil pan drain plug.
Broken timing chain cover gasket.
Blocked camshaft bearing drain hole.