Ask them about the diff rubber mounts and I know how you feel and I had the spark plugs changed with no luck, I also had the MAF replaced with no luck so now it seems to come down to either the diff mounts so thats my next $tep. Other than that the X5 drives beautiful and safe.

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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