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The fluid used in a transmission is part of the design. With the exception of engine oil I never use anything but OE fluids. I have changed the fluid every 50,000 miles and in spite of all the engine mods I have done the transmission is working fine after 122,000 miles.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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