For 1990-2009 cars

• | Low oil level. Fill to full mark on oil level indicator.

• | Incorrect or malfunctioning oil pressure switch

• | Incorrect or malfunctioning oil pressure gauge

• | Improper oil viscosity for the expected temperature

• | Oil pump worn or dirty

• | Malfunctioning oil pump pressure regulator valve

• | Plugged oil filter

• | Oil pump screen loose plugged, or damaged

• | Excessive bearing clearance. Replace as necessary.

• | Cracked, porous or restricted oil galleries. Repair or replace block.

• | Oil gallery plugs missing or incorrectly installed. Install plugs or repair as necessary.

• | Oil diluted by moisture or unburned fuel