I can say the BMW OE fluid is an expensive synthetic fluid, but if you plan on servicing the fluid at a normal basis as with other vehicles you should be fine with normal gear lube. The Redline 75W90 mentioned above by CharlieHustle is a synthetic lube as well and a fraction the price of BMW's lube... Should be perfectly fine.

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X5 pics

RIP 4.6is.....

2003 4.6is