Oil Pressure Gauge Up & Down

Discussion in '80-Series Tech' started by sejinro, Feb 13, 2009.

  1. sejinro

    sejinro

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    Does anyone know why the oil pressure gauge would go up when accelerating and then down when slowing down. Well, that's what my LC does, actually for a while now.

    To mitigate, I recently changed the oil, all fluids and valve gasket.

    Thanks!
     
  2. tblume

    tblume

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    oil pressure is directly related to RPM, if you are lower than the low mark on the gauge when driving I'd worry, but if you are close to the top of the normal range while driving and at the bottom of the normal range when idling you ought to be fine.
     
  3. zbuck

    zbuck

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    MIne does the same thing and it is all related to RPMs, like tblume said. AS long as it isn't dropping when you are in the gas,t hen you shoudl be fine.
     
  4. e9999

    e9999 You want to do what...? Moderator

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    yes, of course, the oil pump.

    Mine tops off a hair over the 2/3 (or is it 3/4?) line regardless of rpm above that. Presumably where the pressure relief valve kicks in...
     
  5. sejinro

    sejinro

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    Thanks!
     
  6. sejinro

    sejinro

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    Yes, it increases as I drive faster then decreases as I slow down. But, it doesn't go to a low point when idle. Should be okay then. Thanks!
     
  7. e9999

    e9999 You want to do what...? Moderator

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    the absolute level of pressure you'll see on the gauge will also depend significantly on the weight of the oil. When I switched to 15W40 there was a big jump up in pressure, as expected.
     
  8. 96r50

    96r50

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    Read the owners manual. It explains the oil gauge behaviour and acceptable ranges.
     
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