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Old 12-05-2012, 11:33 AM
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 awdrev View Post
So even if the factory used DIII fluid, I should just go ahead and put xDrive fluid?
Yes, most certainly. ASAP
ATF has always been used in transfer case applications for any vehicle maker, but if BMW felt that all the interventions of xDrive demanded a more complex fluid formula, that's perfectly believable.

Originally Posted by awdrev View Post
.... and all I have to say is who in the world thinks plastic will hold up to extreme conditions? would it cost that much more to make the little part out of metal?
Not standing up for BMW, but the general industry direction is to reduce weight wherever feasible.

Might not seem much in isolation, but it all adds up.

Cost to the car maker certainly comes into it, but I think they would argue that's not their primary reason for using plastic impellers, plastic expansion tanks, etc.

Not sure which is preferable for the average owner, a metal impeller that corrodes down to nothing because the coolant didn't get changed often enough, or a plastic one that fails through old age.
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