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.

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.

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