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The X5 Diesel had an engine breather filter that was prone to clogging (earned its self a nick name of the bog roll filter) if your car still has one of these old filters it can cause the white smoke cold starts and after idling. Most have been changed to vortex type filters which superseded the early ones. The pre heaters can also fail giving white smoke at start though this normally clears when up to temperature Fingers crossed it is a simple and economical fix Dave

Morning Andrew Google HID's Direct they have plenty of experience and a good reputation. Both of my sons have used their upgrade kits, and on my youngest sons Toyota the difference is literally night and day. Just make sure you have headlamp washers so you don't fall foul at MOT time as I believe the lighting regs state washers or self leveling or both