keep it, or buy another e53 4.8is with ext warranty if that is the only issue you have....Most ppl still choose the e53 over e70 and its for a reason! OR, lol, wait for X6 and you definetly be payin msrp on that!

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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