oil problems?

Could very easily be as simple as a flabby oil pressure sender.

There are two ways to go from here: you could just throw in a new correct sender and see if the problem goes away. Or you could do the proper diagnosis: warm up the engine, put a known-good, mechanical oil pressure gauge in place of the sender to see what the actual, real pressure is with the engine hot and idling. If it's lower than the minimum spec, you have some deciding to do (different grade of oil, different/better filter, new oil pump, engine overhaul) based on how many miles are on the engine, how much oil it uses, etc.