I had 90k miles on my 06 330i e90 when I changed it, bought new filter/pan, 6 liters of ZF lifeguard 6 and a filler plug for $238 from a ZF Dealer... Just a drain and fill, no flush... I have 138k miles now, probably going to do it again around 150k because we didnt get it all, apparently there are 9 liters total. It shifted a little off for the first 10 miles, then straightened out... still running strong...
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