GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

Incorrect engine oil (viscosity)

Install the correct engine oil and oil filter. Refer to Engine Oil and Oil Filter Replacement .

Incorrect oil filter (without anti-drainback feature)

Install the correct engine oil and oil filter. Refer to Engine Oil and Oil Filter Replacement .

Worn, damaged or improperly installed oil filter by-pass valve

    • Inspect the oil filter by-pass valve.
    • Repair or replace damaged components as required.

High valve lifter leak down rate

    • Inspect the valve lifters.
    • Repair or replace damaged components as required.

Worn, damaged or improperly installed crankshaft thrust bearing

    • Inspect the crankshaft.
    • Inspect the crankshaft thrust bearing.
    • Repair or replace damaged components as required.