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Oil Pressure gauge flucuates from over 40 to close to red zone when idling

(1996 Pontiac Bonneville)
in Greensboro, NC on July 22, 2011
When the engine first starts up the gauge reads over 40, it will drop slightly when you start to drive. When you have to stop at traffic light the gauge slowly drops toward red zone and pressure rises again when you accelerate.
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