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Old 12-06-2012, 09:20 PM
Supercourse Supercourse is offline
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Location: British Columbia, Canada
Join Date: Feb 2008
Posts: 3,890
Mein Auto: 2004 X3 2.5i
Originally Posted by x3brian View Post

Tranny is dexron iv
Differentials are 75w90
Transfer case is BMW xdrive fluid
I'll fine tune that before I drink some fortified wine:

Tranny is Dexron VI (Why does GM confuse us with Roman numerals? Label it Dexron 6)
Differentials are synthetic 75w90
Transfer case is BMW xdrive fluid, Part No. 83 22 0 397 244

BMW specifies Castrol SAF-XO for the differentials which is apparently available in Canada (for about $47) but not in the U.S.
No indication that it is different from any other 100% synthetic 75W90 gear oil.

Originally spec'd. Shell or Esso fluid for the 5 spd. A/T may still also be available at a high price.
Is it better to use that over Dexron 6 in the 5 spd. transmission? Don't know.
Owners that have converted to Dexron 6 don't seem to report any problems.
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