Oil pressure over the top

Discussion in 'General Chevy & GM Tech Questions' started by cutabovetherest, Jan 1, 2009.

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  1. cutabovetherest

    cutabovetherest New Member

    New Years eve we drove the to a local movie theater and on the way home the oil pressure was reading 80,or if I put the wrong number in there at the highest level. It also was running with a lot less horsepower but I'm sure that was also due to the oil pressure. Any tech's or anyone else know what the problem is?
  2. unplugged

    unplugged New Member 1000 Posts 100 Posts

    It does help to know what model/year/equipment you have. Generally a high oil pressure reading is caused by a few things.

    1. Thickened oil.
    2. Clogged oil filter
    3. Stuck pressure relief valve.
    4. Instrument cluster defect.
    5. Faulty pressure switch.

    For thickened oil, an oil/filter change would be recommended. Extremely cold temperatures can boost oil pressures, and you can switch to a different viscosity to adjust for seasonal variations.
    For a clogged filter, change oil/filter.
    For a stuck pressure relief valve try changing the oil and using a crankcase flush.
    Instrument cluster defects and faulty pressure switches can give a false reading. GM has a history in the late model trucks with defective instrument clusters. Usually this affects the whole cluster lighting and gauges. Oil pressure switches are a cheap and easy replacement.

    High oil pressure is not typically something to be concerned about. A sudden increase in pressure points to a stuck pressure relief valve.
  3. cutabovetherest

    cutabovetherest New Member

    Ours is an '03 4x4 that is fully loaded stock , i know that cold weather typically that is the reason, but it just seemed odd that after i drove it for about 30 minutes it still stayed at the very top. I am going to give it a look at and see if it has went down.
  4. cutabovetherest

    cutabovetherest New Member

    Sorry, it just came to him we're overdue for an oil change, sorry for wasting a post. Silly mistake, once again sorry

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