Question about 1998 GMC Sierra

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Low oil when engine warms up gmc sierra 1995

1995 gmc sierra oil pressure okay until engine is warmed up then drops to 30-40 at idle can you help me.

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  • Anonymous Mar 14, 2014

    Gmc sierra oil gauge going to zero

  • Anonymous Mar 22, 2014

    oil pressure sender starts out at 40 w/key on eng. off & goes to 80psi when running at idle. have tried other senders with very little difference.this is a6.5lt turbo. tried jiggle testing wires&got nothing. any suggestions

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30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.

Posted on Dec 07, 2008

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