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Originally Posted by realchef
Thinking about diff fluids too. What do you guys think? JCL, I think you said before not to change the Transfer case, just diff?
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I think that the differentials and transfer case do not have the same issues around the risk of changing as the transmission. They are straightforward drain and fill applications. If you are going to change the differential fluid, you may as well change the transfer case fluid at the same time. I think of them as 100,000 km or 60,000 mile change points, but that is just my opinion.
I would ensure that you use factory OEM fluid in all of them, as BMW does not publish good (universal) specs for aftermarket fluids and there is nothing wrong with the factory fluids, and little to be gained by playing roulette with aftermarket blends. That also covers the risk of not using the correct fluid for the clutches in the x-drive transfer case.
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