1. TSBs

    Replacing BMW O-Rings

    Oct. 9, 2023
    If the BMW Z4 vehicle exhibits a transmission fluid leak in the area around the oil cooler lines on the transmission side, chances are the O-rings are damaged due to “unfavorable” cooling line connection tolerances.
    BMW
    If the fluid leak originates from the cooling line area, replace the O-rings and the cooling lines. Only replacing the O-rings may result in a repeat failure.
    If the fluid leak originates from the cooling line area, replace the O-rings and the cooling lines. Only replacing the O-rings may result in a repeat failure.

    If the BMW Z4 vehicle exhibits a transmission fluid leak in the area around the oil cooler lines on the transmission side, chances are the O-rings are damaged due to “unfavorable” cooling line connection tolerances. If the fluid leak originates from the cooling line area, replace the O-rings and the cooling lines. Only replacing the O-rings may result in a repeat failure.

    About the Author

    Information courtesy of Mitchell 1

    Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

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