You have an oil leak.
A 1992 Buick Regal 3800 needs approximately 4.5 quarts of oil. The oil can be purchased at any auto parts store such as NAPA.
As soon as the 2003 Buick Regal change oil light comes on, it is important to do so immediately. Not changing your oil can damage the motor in your car.
The Oilpressure switch is located near the oil filter, just upper side with the electric wires plug in
If it's later than 99 should be 134A
It should be located near the oil filter witch is under the power stearing pump. On the passenger side at the back of the engine. If the pressure switch is broken, you sould see your oil light on and have a trouble code on your computer, if you have a pressure indicator in the dash, it would indicate way to high pressure.
The 2001 Buick Regal needs oil added if the level of oil on the dipstick is at or below the Add mark. Checking the oil at every stop for fuel is good practice to catch major leaks early.
You can prime the oil pump on an 85 Buick Regal by removing the distributor and inserting a priming rod onto the oil pump shaft. It can then be turned by hand or with a drill to distribute oil throughout the engine.
should be located on front of engine above the oil filter.