For 1990-2009 cars

Problem | Action
--- | ---
The oil level is low. | Fill the oil to the FULL mark on the oil level indicator.
The idle speed is slow. | Adjust the idle speed.
The oil pressure switch is incorrect or malfunctioning. | Replace the oil pressure switch.
The oil pressure indicator is incorrect or malfunctioning. | Replace the oil pressure indicator.
The oil viscosity is improper. | Fill the oil tank. Use oil of the proper viscosity for the expected temperature.
The oil is diluted with one of the following materials:

• | Moisture

• | An unburned fuel mixture

Fill with new oil.

The oil pump is worn or dirty. | Replace or clean the oil pump as necessary.
The oil filter is plugged. | Replace the oil filter.
The oil pickup screen is loose or plugged. | Adjust or replace the screen as necessary.
The oil pickup tube has a hole. | Replace the tube.
The bearing clearance is excessive. | Replace the bearings as necessary.
The oil galleries display one of the following conditions:

• | Cracked

• | Porous

• | Restricted

Repair or replace the block as necessary.

The gallery plugs are missing or incorrectly installed. | Install the plugs or repair as necessary.
The oil pump pressure regulator valve is malfunctioning. | Replace the valve.
The camshaft is worn or poorly machined. | Replace the camshaft.
The valve guides are worn. | Replace the guides.