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Old 12-05-2012, 10:29 AM
Supercourse Supercourse is offline
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Location: British Columbia, Canada
Join Date: Feb 2008
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Mein Auto: 2004 X3 2.5i
Originally Posted by awdrev View Post
But I also have read that if mine used A/T fluid, it would be best if I started using xDrive fluid... The switch of liquid concerns me, is there a way to know which one is it? Maybe through the VIN or through a label...
Not really, but if your build date is prior to March 2005 the factory fill was certainly Dexron III A/T fluid.

When you drain it, you should be able to tell from the reddish color.

The xDrive fluid is a very light color.

It's not like other instances where there is a concern that some of the old fluid remains in passages and may be incompatible with the new fluid.

Opinions vary, but changing it about every 50K miles seems right.
The other concern is, for any model year, the factory fill for both the transfer case and the 2 diffs. (synthetic 75W90 gear oil) has been observed to be on the low side.

This may or may not have been a factor in the few cases of early transfer case and diff. problems (clunking, outright failure).
More likely just variances in how well the supplier assembled the gears at their plant.
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