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  1. #1
    Bobtail Member
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    Peterbilt Cat C15 oil pressure problem

    Hi,
    Does anybody know what is the normal oil pressure for C15 on idle when the engine is hot or cold?
    I`m getting around 20-30 psi on idle with hot engine since the manual says it needs to be between 40 and 80 psi.

    At 1200 rpm oil pressure is around 60 psi.

    Thanks!

  2. #2
    Road Train Member Mommas_money_maker's Avatar
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    How many miles since last oil change and are you full of oil on the dip and how many miles on the engine?

  3. #3
    Bobtail Member
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    It has 1 007 000 miles and the oil is changed about 1000 miles ago and has lucas oil stabilizer.

  4. #4
    Medium Load Member truckmechanic's Avatar
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    Sounds about what all our cats are running at

  5. #5
    Bobtail Member
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    So is it a normal to be 20-30 psi on idle.

    The strange thing is that before it was around 60 when pulling and now goes no more than 45 psi with load.

  6. #6
    Medium Load Member truckmechanic's Avatar
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    Have you ever rolled I'm main bearings the oil pressure relics valve might be getting week what oil filter are you running

  7. #7
    Road Train Member Mommas_money_maker's Avatar
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    I was thinking rods and mains bearings are due for change, they used to be changed around 725,000 and that would definitely cause a loss of pressure along with oil pump