Oil coming out of breather on rear differential on 579

Discussion in 'Peterbilt Forum' started by Edjahman, Jul 25, 2018.

  1. Ridgeline

    Ridgeline Road Train Member

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    How does one tell if the oil is good?

    Get an oa done on the oil.
     
    thaistick Thanks this.
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  3. Espressolane

    Espressolane Road Train Member

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    Just south of the north 40
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    You can run a sample on a test system.
    The results will look alot like an engine oil test.
    A good test unit will be able to load the basic profile of the sample stock.
     
    Edjahman Thanks this.
  4. Edjahman

    Edjahman Medium Load Member

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    Apr 2, 2013
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    We sent a sample out the other day, so cross your fingers crossed guys.

    Thank you for your replies!
     
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