Two things. The kit link takes you to nothing available. You have to get the filter and then add the oil. No biggie, just what it is.

Second You can drain and fill. run through the gears on stands or the road and then remove 4 quarts and replace them to get 90 +/-%

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BMWCCA # 480346

'72 e6Tii rip
'90 e30iC sold