- Oil viscosity too low: 10W40 oil is relatively thin and may not provide adequate protection for your car's engine. Cadillac recommends using 10W-30 or 15W-40 motor oil in the 1982 Eldorado.
- Oil filter not seated correctly: Make sure the oil filter is seated correctly and that the gasket is in place. A loose or improperly seated oil filter can cause low oil pressure.
- Oil pump failure: The oil pump may be failing and not able to circulate oil properly. Check the oil pressure with the engine idling. If it is less than 10 psi, the oil pump may need to be replaced.
- Engine damage: If the engine has sustained damage, such as a cracked oil pan or worn piston rings, it can cause low oil pressure. Have the engine inspected by a qualified mechanic to diagnose the problem.
Recommended actions:
1. Check the oil level and add oil if necessary. The oil level should be between the "full" and "add" marks on the dipstick.
2. Inspect the oil filter. Make sure it is seated correctly and that the gasket is in place.
3. Check the oil pump. If the oil pressure is less than 10 psi with the engine idling, the oil pump may need to be replaced.
4. Have the engine inspected. If you are still experiencing low oil pressure after taking the above steps, have the engine inspected by a qualified mechanic to diagnose the problem.
