Replaced with official BMW remanufactured auto tranny @ 137K miles. I did do ATF flush with Redline ATF @ 121K miles (probably should have done it sooner, but at that time in 2005, I was getting so many different opinions...) 2001 X5 had "lifetime" fluid, which later I found out BMW's definition of "lifetime" is 100K miles.

Anyhow, even today, the BMW dealers balk about changing tranny fluid, but I would probably use BMW specific ATF fluid.

Mind you, I had an automatic tranny 325is with ATF fluid flush every 30K miles and guess what, the tranny lasted till 295K miles with no problems.

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