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Oil Pressure

BoogieShoesMikeBoogieShoesMike San DiegoPosts: 2
edited March 8 in Oldsmobile
My car has 102,000 miles. It has the 4.0 V-8 North Star motor. I checked the oil and it was down a little over a quart. I added a quart of Valvoline High Mileage 10w-40, this is the same oil and weight I have always used. When I drove the car, my oil pressure started to randomly read zero, then shoot up to 125lbs and then be fine for awhile. The readout would repeat this over and over again. It's still doing this, it has been going on for about 2 weeks now. I have never had this experience before and I am 70 years old. I have owned, now 5 Auroras since 1994. My first one had over 300,000 miles on it when I bought my second one, never have I had this experience with any of them. My mechanic can't explain it either.
Any ideas..............?


  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 22,982
    I'd suggest replacing the oil pressure sender/switch.
    It's in the electrical-switch and relay category of parts under Oldsmobile 1999 aurora.
    About $30

    I had the sender go back on my 3800 leSabre. I believe mine just went to a high pressure and stayed there...

    It may be easy to get to. If you'r got a mechanic, it's a piece of cake.You might try removing and replacing the connector and check the wiring on it for breaks. But the idea it's going to 0 or 125 suggests it's not a break. That would alternate between a normal reading and one of the extreme readings.

    Good luck.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • BoogieShoesMikeBoogieShoesMike San DiegoPosts: 2
    edited March 8
    Thanks for the suggestion, the other weird thing is that before I added the oil. I didn't have this problem! My oil pressure is in the form of numerical readout on the systems monitoring panel, not a manual gauge.
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 22,982
    I understood that. The readout on my leSabre 03 was digital.

    If the engine does not make noises from the lifters having too much play because of no oil pressure pumping them up when the gauge reads "0", you most likely still have oil pressure.

    I can't recall if my leSabre went high or low on the reading. But I have read enough reports on car forums about the H-bodies that I knew what it was likely to be.

    Mine just gave a bad reading when I started it up after being at some store. Sender just decided it was time to not cooperate.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

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