For 1990-2009 cars

### Cleaning Procedure

1. Clean the oil filter adapter components with non-corrosive solvent.

Caution: Refer to Safety Glasses Caution in the Preface section.

2. Dry the oil filter adapter components with compressed air.

### Inspection Procedure

Important: The internal parts of the oil filter adapter are not serviced separately. If wear or damage is noted, replace the entire oil filter adapter assembly.

1. Inspect the oil filter housing for cracks, scoring, casting imperfections (1) and damaged threads (3).
2. Inspect the drain back valve (2) for damage or blockage.
3. Inspect the oil filter cap for cracks, scoring, casting imperfections (1) and damaged threads (2). Replace as necessary.
4. Inspect the oil filter cap O-ring (3) for damage. Replace as necessary.
5. Inspect the bypass valve (1) for damage or blockage.