* Low Oil Level: This is the simplest and most easily checked cause. Check your oil level using the dipstick. If it's low, add oil of the correct type and viscosity (consult your owner's manual). However, if the light comes on *after* you've added oil, there's a more serious underlying issue.
* Oil Pump Failure: The oil pump is responsible for circulating oil throughout the engine. A failing oil pump can't generate sufficient pressure. This is a major mechanical failure.
* Worn or Damaged Engine Bearings: These bearings support the crankshaft and other rotating parts. Wear or damage can lead to increased oil clearance and reduced pressure. This is also a significant problem requiring engine repair.
* Clogged Oil Filter: A clogged oil filter restricts oil flow, reducing pressure. Replacing the filter is a simple fix, but again, if the light remains on after replacement, there's a deeper problem.
* Leaking Oil Seals or Gaskets: Oil leaks reduce the overall amount of oil in the system, leading to low pressure. This requires locating and repairing the leak(s).
* Faulty Oil Pressure Sending Unit or Sensor: This sensor monitors oil pressure and sends a signal to the light. A faulty sensor could be falsely indicating low pressure even if the pressure is fine. This is a relatively inexpensive part to replace, but should only be considered *after* you've ruled out other possibilities.
* Excessive Engine Wear: Significant wear on the engine's internal components can increase the clearances and lead to low oil pressure. This often signals the end of the engine's life.
What to do IMMEDIATELY:
1. Pull over safely to the side of the road as soon as possible. Do NOT continue driving.
2. Turn off the engine. Continued running could cause irreparable damage.
3. Check the oil level. If it's low, add oil (if you have some that's appropriate for your engine). But again, this doesn't fix the underlying problem if the light stays on after adding oil.
4. Have the car towed to a qualified mechanic. Do not attempt to diagnose and repair this yourself unless you have significant mechanical experience. Low oil pressure is a very serious issue.
The 1995 Cadillac is an older car, so significant wear and tear is a more likely culprit than a simple sensor problem. Get it checked out by a mechanic as soon as possible to prevent more costly damage.
