GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

Incorrect oil filter without anti-drainback feature

Install the correct oil filter.

Incorrect oil viscosity

Drain the engine oil and replace with the correct viscosity oil.

Damaged or faulty oil filter by-pass valve

    • Inspect the oil filter by-pass valve for proper operation.
    • Repair or replace as required.

High SHLA, valve lifter, leak down rate

Replace the SHLA, valve lifters, as required.

Worn crankshaft thrust bearing

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