For 1990-2009 cars

• | After running the vehicle for a few minutes on a level surface, turn the engine off and allow for adequate drain-down time (2-3 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.

• | Inspect for the following:

- | Oil contamination

- | Oil diluted by moisture or unburned fuel mixtures

- | Improper oil viscosity for the expected temperature

- | Incorrect or malfunctioning oil pressure sensor

- | Incorrect or malfunctioning oil pressure gauge

- | Plugged oil filter

- | Malfunctioning oil bypass valve

• | Remove the oil pressure sensor at the front of the engine.

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

• | The minimum oil pressure of a warmed engine at idle is 150 kPa (21.7 psi).

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

- | Worn or dirty oil pump

- | Oil pump screen loose, plugged, or damaged

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

- | Malfunctioning oil pump pressure regulator valve

- | Excessive bearing clearance

- | Cracked, porous or restricted oil galleries

- | Oil gallery plugs missing or incorrectly installed

- | Broken valve lifters