When under a load (as in taking off when stopped), oil pressure gauge is is about 80 and then when shift gears, gauge pegs out, then again when accelerating the gauge goes back to 80. also in park and at idle, gauge is pegged, then when rpms are brought up (in park) the gauge comes back down to 80 or so. (this is a in line 6 cly) thanks for any suggestions.
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First off I wouldnt drive your car until you make sure that you have indeed oil pressure and that the gauge is a false reading, driving your car if in fact it has no oil pressure will severly damage your engine, but firstly i would check the oil pressure switch its located on the passenger side of the engine right back from the oil filter make sure the connector is clean and free from oil and corrosion if the connector appears to be in good shape take a paper clip and insert it between the 2 terminals inside the connector your oil pressure gauge should peak at 80 PSI that tells you that your gauge and all related wiring are good and in working condition, secondly remove the oil pressure switch and hook an manual oil pressure gauge up to you engine and start the engine the guage should have a oil pressure reading anywhere from 30 PSI to 55PSI depending on engine temperature if theres oil pressure on your manual gauge replace the oil pressure switch with a new unit, if you still have 0 PSI on your gauge then stop your engine immediatly and start looking at your oil pump and lubricating system for a problem.
In an engine in good condition, oil pressure is a function of RPM. Higher rpm, higher pressure. Whne coasting downhill, in gear, the engine rpm will increase, hence, the oil pressure will go up, as required, and as expected.
There is nothing wrong with your engine, unless the oil pressure goes excessively high under any regime. Low oil pressure is a sign of low rpm, or under load, a sign of worn parts.
If your oil pressure is running in the red this would indicate too much oil in the system. You should have your oil changed and refilled soon or you run the risk of burning out the oil pump. At idle your pressure should be just over a quarter of what your gauge has. At highway speed it should not exceed 3/4 of the gauge unless your going in excess of 100 MPH. Change the oil and filter and your vehicle should be fine.