Question about 1999 GMC Suburban

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My oil pressure gauge goes to 80...the gauge buries when i start it up but once it gets hot it runs bout 60...press the gas and it buries again

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Replace the oil pressure sending uint on the engine.

Posted on May 07, 2010

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Oil pressure gauge in at 80


80 is ok unless it says 80 when the engine isnt running,turn on ignition and check the oil pressure,it should read 0....

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While driving the oil pressure gauge sits between 60 and 65 psi but when i get on the gas it shoots up to 80 psi. When idling it sits on 40 psi.


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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.

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