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I know this has already been discussed here before, but I don't think my problem is the sending unit like Moon replied lower. First, I have a 1992 Cavalier RS (automatic) and when I've been using the car for some time (at least 1 hour) the oil pressure indicator STALLS between 0 and the first quarter of the graduations even when rolling at 100 km/h (2200 RPM). If I stop and rev it up, the indicator doesn't move ! Normally when the car idles with engine running cold, the oil pressure indicator is just a little higher than half (max is 550 on mine) and when I rev it up, the pressure rises a bit. This is why I think it's not my sending unit that is damaged because when the engine is cold, the indicator would be low too, no ? I thought maybe it would be that O-ring in the pump (never changed it), or the pump itself. Anyone had this prob and got it fixed ??? Oh, btw no red light (CHECK GAGES) comes out.
 

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Not necessarily. When my sender went bad, it read fine until the engine got warmed up, then it went wacko. Think it is the heat that gets to it?

I would still check the sender before anything else
 

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My sender went bad and would spike comming to a stop a couple of times then read low. I changed it and my oil and the pressure seems fine now. But my pressure would rise as the revs rose, so I don't know about that. Change your oil to a 10w30 or 15w40 if you don't use that, and if it still dosen't respond, put a product like Motor Honey or Hitach in it. If it responds to that, its a motor pressure problem, and hope it holds in for a while.
 
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