How long to drive between multiple drain/fill to get fluid mixed?

[John105]

I too have tge ZF 8 speed in our X5. I do a drain & fill @ 60k, then again at 10-15k. This will refresh your current fluid, to get rid of clutch material particles & replenish due to heat wear on the fluid. If you buy your fluid from FCPEURO, they will honor their lifetime warranty.

You’ll be good. As explained to my by the indie shop (and online), when you start the drain and fill at a time the fluid is still good (not burnt up), it’s totally safe to drain and fill. For me I was at 81k so I was concerned (car purchased used). They said I’m 100% fine, so I’m at 135k now and even had to have.n output shaft seal replaced and tranny going strong…

 

[nicholas]

5 mins....
If this is the first atf change, I'd do 3 drain and fills.
Enjoy the clean transmission and great shifts.