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They'll refuse warranty on the XDrive if you don't use approved brand and model of tyres so... my bet is on them wanting to extort all the precious money they can from their poor customers

>>monega+(OP)
They'll refuse warranty if the difference between thread is too much between front and back as that causes wear of the clutches. Just like you should have the same tire on the same axle.

Or if the tires are not the right size, especially in staggered setups.

If you come from a car that is FWD with AWD capabilities, it doesn't matter as much.

But BMW (at least the ones with the engine mounted longitudinally) which have xDrive are permanent AWD.

>>monega+(OP)
This is why the Chinese brands will eat their cake.