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Thread: M30B35 Whinning noise, most noticeable when cold.

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    M30B35 Whinning noise, most noticeable when cold.

    My engine recently developed some kind of whinning or hissing sound coming from, I belive the front of the engine.
    i have seen some threads about this in the past but no one wrote a conclusive answear as to what It could be.
    I removed the V-belts to make sure the sound wasn't related to any engine accessories. Right now I belive the sound is coming, either from tjhe timing case or maybe it could be a vacuum leak. It gets louder with RPM, it is present in the cabin and is most noticeable when the engine is cold. I am running liqui moly 10W40 with MOS2 additive as we're approaching winter time. Currently the engine has 170k miles
    Any answears will be greatly appreciated as I am at a loss here... Any further information will be provided. Thanks everybody.

  2. #2
    moroza's Avatar
    moroza is offline MORΩN ΛABIA BMW CCA Member
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