For 1990-2009 cars

• | With the vehicle on a level surface, allow adequate drain down time (10 minutes) and measure for a low oil level.

| Add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.

• | Run the engine and verify low or no oil pressure on the vehicle gauge or light.

| Listen for a noisy valve train or a knocking noise.

• | Remove the oil pressure sender or another engine block oil gallery plug.

• | Install the oil pressure gauge and measure the engine oil pressure.

• | Compare the readings to the Engine Mechanical Specifications.

• | If the engine oil pressure is below specifications, inspect the engine for one or more of the following:

- | Oil diluted by moisture or unburned fuel mixtures

- | Improper oil viscosity for the expected temperature

- | Incorrect or malfunctioning oil pressure sender

- | Incorrect or malfunctioning oil pressure gauge

- | Plugged oil filter

- | Malfunctioning oil filter bypass valve

- | Broken valve lifters

- | Oil pump screen loose, plugged, or damaged

- | Oil pump screen O-ring seal missing or damaged

- | Oil pump-to-engine block bolts loose

- | Oil pump worn or dirty

- | Malfunctioning oil pump pressure regulator valve

- | Inspect oil pump driveshaft

- | Oil gallery plugs missing or incorrectly installed

- | Excessive bearing clearance

- | Cracked, porous or restricted oil galleries