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Old 09-22-2011, 08:21 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 fun2drive View Post
Transfer case had 63K and I wish I had done it at 50K but oh well. It was very black and holds only 0.6L of BMW fluid. Easy to change.

...... 30K miles for the transfer case since it is where all the power is sent from the engine and just too important and contains such a small amount of fluid to not change it often.
Very true. Don't care what BMW recommend.
For extended engine drain intervals, they have the large oil capacity on their side.
Not so with the transfer case, which as you say, conducts proceedings in the final drive.
Either differential has an easier life in comparison.

I did my TC around 30K miles (48K km) and the fluid was quite dark
(pictures in a post in the DIY sticky).

Might have been a bit early - agree that 63K miles is getting near the must do point.

Other members who have waited to around 80K miles have seen metal flakes in the drained fluid.

Some variability in the reported capacity (allowing for minor spillage) - some even close to the full 1L.
Mine was 0.6L too, so 2 bottles from the dealer of the expensive stuff might be good for 5 or 6 years assuming average annual miles.

The need for A/T fluid changes can be debated at length, but for the TC - just do it.
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