ppl do change thier milages. period. i dont know how i would do it on a x5 like mine because i at the dealer almost all the time it seems like, esp latelly but i heard alot of people doin it with the exception of some cars, mostly the mercs...

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" Despite its supercar attributes, the M5 still doubles as a soberly practical, spacious saloon - only with the ability to scare four passengers in comfort all the way to the local coronary unit". Top Gear