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When oil is cold, pressure will read high, but as it warms up pressure indicator should drop to normal. Are you using the correct weight oil for your weather conditions? Running straight 30 weight, or say 20w50 could cause this issue.
Assuming you have enough oil (there is a separate low oil sensor) and you have replaced the filter (can go bad) a lot of times the oil pressure sensor is the problem, especially if it is intermittent and your engine is still sounding smooth.
The sensor located right above the oil filter - you need to access from under the vehicle after removing the starter motor (disconnect battery first). You will need a 27mm (1-1/16") deep socket to be able to unscrew the old and screw in the new sensor - do not tighten very much - 15 ft lbs I think.
The sensor is CA$38 at the dealership.
It is really hard to get to, but really easy to change.
Unhook the battery cable so you don't blow the new one when you install it. Depending on the location, you may have to remove the oil filter to be able to access the sensor.
Unplug the wire off the end of the sensor, slip a socket onto the old sensor, and unscrew it like you would a spark plug. Before you out the new sensor in make sure it has Teflon tape on the threads. I always a little more than what comes with it.
Screw in the new sensor "hand tight" - then 1/4 to 1/2 turn past hand tight; do not over tighten. Plug the wire on the end. If you removed the oil filter, replace it with new one. Last step - replace the battery cable.
Depending on engine model traditional Buick design V-6 3800 switch is located in oil filter adapter housing can be seen on passenger side through wheel well. takes a deep 1 1/16 oil pressure socket to replace. Other model Chevy base V-6 3400 located next to oil filter on the front side of engine just above engine cradle frame this one uses a shorter sensor can be replace with a standard socket. 1 1/16 also
well go to auto parts store buy the oil pressure sending unit then while you at auto parts store you can take new oil pressure sending unit try different size sockets to find the correct size socket you need.
Typically they are 1 1/16" but a regular deep well socket usually doesn't have a large enough opening on the inside to clear the plastic part of the sensor. They make sockets in this size just for oil pressure switches. I went the cheap route and bought a craftsman socket then removed the extra part of the socket on the inside with a die grinder. Took about ten minutes to do.
Sounds like either the oil pressure switch or sending unit. If you have a oil light on the dash it is a switch. If you have an oil pressure gauge on the dash it is a sending unit. Either way a new one should fix the problem.
Most of them will require a socket just for oil pressure switches/sending units. they are deep and the insides are milled out more than a traditional socket in order to accommodate the body of the sensor. Sometimes there is enough room to use a wrench to remove the sensor as well.