Tyres for BMW X3

I am considering buying a used X3 but have been told that all 4 tyres must be changed at the same time, every time. Something to do with 4wd transfer box (?). I find this very strange - but is it true.

Asked on 4 August 2012 by J.W.Evans

Answered by Honest John
Yes, otherwise the electronics become confused by the different rotational speeds of the tyres.
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