Most dealers probably fill all 3 with bulk 75W90 from a big barrel. It's interesting to read over in the 200 series forums how some folks will tie themselves up in knots over TC fluid, despite the fact that the 200 has a massively-oversized T-case that rarely has issues
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I personally like Mobil Delvac 75W90 as it's full-synthetic but lacks a limited slip additive (one of the few fluids readily available in the US that checks those boxes). It's very quiet in my T-case, although I've also ran basic Valvoline 80W90 conventional in it. The Delvac is $13/quart on Summit Racing.
I personally like Mobil Delvac 75W90 as it's full-synthetic but lacks a limited slip additive (one of the few fluids readily available in the US that checks those boxes). It's very quiet in my T-case, although I've also ran basic Valvoline 80W90 conventional in it. The Delvac is $13/quart on Summit Racing.