Sludge in the blowby

Discussion in 'Ask An Owner Operator' started by DT Trucker, May 9, 2025.

  1. DT Trucker

    DT Trucker Bobtail Member

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    Feb 5, 2022
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    I noticed this sludge in the oil tube and blowby tube, should i be worried?
    Cat c12
    670k after overhaul
    Little blowby
    No smoke whatsoever


    Thanks in advance
     

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    Last edited: May 9, 2025
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  3. Spyro2112

    Spyro2112 Medium Load Member

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    Water in oil. Smell it
     
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  4. Jordonh

    Jordonh Bobtail Member

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    Jul 1, 2022
    North Carolina
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    When my E model starting having that, I was getting coolant mixing with my oil had the same sludge as showed in the picture but it was a little more thick then yours though. Pull a valve cover and make sure there is no sludge there.
     
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  5. DT Trucker

    DT Trucker Bobtail Member

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    Feb 5, 2022
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    Definitely coolant in oil, coolant level was very low. Was it a cracked head in your truck or smth else?
     
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  6. wore out

    wore out Numbered Classic

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    CHASIN THE DEVIL'S HERD
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    Could be anything right down to a bad water pump. Pull the oil pan and pressurize coolant system, that’s the only way to know for sure where it’s coming from.



    Or you can poke and hope firing the parts cannon
     
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  7. Magoo1968

    Magoo1968 Road Train Member

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    Do you use any oil additives? In a c12 I ran 5 years ago I added some Lucas and had more blowby and some sludge . Next oil change didn’t add any and it went back to normal.
     
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  8. Jordonh

    Jordonh Bobtail Member

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    Jul 1, 2022
    North Carolina
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    It was a leaking liner for me all of them had some very bad cavitation head wasn’t cracked which I was surprised so I rebuilt it for another use only.
     
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  9. 77fib77

    77fib77 Road Train Member

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    Air compressor?
     
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  10. DT Trucker

    DT Trucker Bobtail Member

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    Feb 5, 2022
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    Yes i usually put 16 fl oz of Energy Release anti friction metal conditioner but i've been using that for years.
     
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