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Unable to solve oil leak on valve cover - 1.6 ZM

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    Unable to solve oil leak on valve cover - 1.6 ZM

    The gasket is new.
    I leaks in the same spot, along the front of the engine, (bolt number 1 if you follow the manual) it may take 2 days to show up. I even used maf cleaner to clean all the surfaces, it was excellent clean on assembly.
    I have done the same operation 3 times.
    I even got the black rtv for the corners, thinking it was leaking from there.
    I torqued and retorque and nothing.

    So far, the only explanation I have seem is the oil itself, is 5W-30 Synthetic Mobil One. But not the brand, but being synthetic, I do not know if it is true but seems that synthetic oil tends to seep more than any other, it was I read.

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    I was thinking of milling the valve cover maybe 1mm to see if I could tight the gasket more, but then I though about the cam sensor so no go there.

    Could it be that this brand new gasket is just bad?
    Last edited by mazdaargento; 12-01-2020, 08:42 PM.

    #2
    I fixed the leaking by doing two things:

    * Changed the oil from full synth to blend,
    * and using the real black rtv (the good, expensive one).

    Apparently the full synth (for this engine that has unknown maintenance) it was too much, so I must run blend a few times to clean the engine during the year before going full synth.

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