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.

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

High valve lifter leak down rate.

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

Worn, damaged, or improperly installed crankshaft thrust bearing.

1. Inspect the crankshaft.
2. Inspect the crankshaft thrust bearing.
3. Repair or replace damaged components as required.