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Thread: Expansion Tank o rings.

  1. #1
    Join Date
    Jun 2011
    Location
    Hanover,PA
    Posts
    15
    My Cars
    2004 325I

    Expansion Tank o rings.

    How tight should the bottom expansion tank o rings be. It’s on my 2004 330xi.Seems like I can move them a bit. Thanks

  2. #2
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    Did you lubricate the o-rings on the expansion tank and its mounting bracket with coolant before mounting the tank?

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