The majority of E70s owners wouldn't have tuned or trashed their cars given it is a 4WD and family oriented vehicle, unlike high performance BMWs like a ///M3 where the owners might trash it around the track with launch control, high speed cornering etc.

Generally a typical rear diff shouldn't break under normal use, we are talking about a 7-10 yrs old car. Once we have established the number of affected pre-LCI E70s, perhaps it is time for BMW to consider a recall on the faulty rear diff.

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'07 X5 3.0d - Black Sapphire Metallic / Camel interior
Specs: Sport pack, Executive, 7 Seats, OEM 336, Hifi
Mods: Aero Kits, Titanium grilles, 4.8i exhaust, Tinted, ///M Footrest, OEM Sport pedals, OEM Rubber mats, OEM Sunshades, LCI Taillights