I have a 94 Grand Am 3.1 V6. Lately I have noticed that the oil pressure gauge seems to jump about, whereas before it seemed to be pretty stable. The gauge goes from 0-550. Usually the car will stay around 275 which is right on the mid point. When I come to a stop it will usually drop down a bit maybe just a bit above the 1/4 mark on the gauge. Then it will climb up again once i start moving. Lately I have noticed that sometimes it will drop down close to 1/4 even if I am travelling at notmal highway speeds. There are no oil leaks anywhere that I can see, and the dipstick indicates that it is not losing any oil.
I was just wondering if this is a reason to be concerned ? What are the normal approximate running values for oil pressure ? Could this be a sign of a serious problem, or something more simple like the oil pressure switch being faulty? The car runs fine. The only other problem I think I might have is a small exhaust manifold leak, but I'm not sure if the
2 are related. Any feedback is welcome.Regards, KDawg