Pentosin vs BMW (vs Redline?) for MT and Diff (2011 135i)

[carcar123454321]

I've found a few things but not a lot. My main question is there any reason not to just get Pentosin fluids, instead of BMW, as it's like 30% cheaper to buy?


I usually us Redline in my previous cars but they weren't BMW.

Car will not be tracked, just spirited driving.