For 1990-2009 cars

### Cleaning Procedure

1. Clean the oil filter adapter in solvent.

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

2. Dry the oil filter adapter with compressed air.

### Inspection Procedure

1. Inspect the exterior of the oil filter adapter for the following:

• | Damage to the mounting holes (1)

• | Damage to the heat shield bolt hole threads (2)

• | Damage to the oil pressure switch hole threads (3)

• | Damage to the bypass plug hole threads (4)

2. Inspect the interior of the oil filter adapter for the following:

• | Damage to the oil filter sealing surface (1)

• | Damage to the oil filter fitting hole threads (2)

• | Blockage in the oil filter fitting hole (2)

• | Damage or blockage to the oil filter bypass hole (3)

• | Blockage to the inlet and outlet passages (4)

• | Damage to the mounting surface (5)

3. Repair or replace the oil filter adapter as necessary.