Incorrect oil viscosity

1. Drain the oil.
2. Install the correct viscosity oil.

Excessive piston-to-cylinder bore clearance

1. Inspect the piston and piston skirt, connecting rod, and cylinder bore.
2. Repair or replace all damaged components.

Damaged or faulty oil filter by-pass valve

1. Inspect the oil filter by-pass valve for proper operation.
2. Repair or replace as necessary.