One of the major things to look for is the malfunction of the seat heater. Many '04 E60s had that problem. In fact my dealer was kind enough to reimburse me for the cost of my suit pants when a hole was burnt into it.

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-2006 E53 (X5 4.4) Titanium Silver, fully optioned (sports package, premium package, navigation, ride height adjustment, panorama moon roof, rear climate package). Aero kit installed plus set of staggered 20s with Diamaris tyres.