It`s great. Basically the diesel models dont warm up fast enough or hot enough so they have an additional little fuel burning engine. This is a webasto thermotop, controlled by the car electrics - on and off when needed etc.

You can buy a remote control kit from BMW which allows YOU to pre warm your car from your house though. I bought and fitted this and it`s one of the best mods I ever did.

Read this thread. http://www.xoutpost.com/x5-e53-forum/...hlight=webasto

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X5 3.0D 2003
Mods:
Webasto telestart remote kit
Aluminium running boards
Tv in motion & Aux input lead, Ice>ink to Ipod 3g.
DVD rear headrest screens and dvd sytem integrated in to main tv system via aux lead (watch tv or dvd in front and back)
Homelink Gate Opener, Chrome Grille Kit, chrome tailgate handle, Chrome Guage Rings, Tunit V-CR 086
Standard:
Bluetooth, comms pack, sat nav, sports pack, sports seats, dimming mirror, electric folding mirrors, memory seats, heated seats.