Welcome as you may know the diesel is not available is the states.

To maintain outside you need to keep it well waxed and wash it about once every other week. You also need to follow BMW oil change interval (not sure what is for the diesel) but you might want to change it more often than recommended.

If you own a IPOD you may want to get a kit so that you can play and control it through the radio.

Good luck and enjoy your X5. If you could post some picture of it we would love to see it.

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Loving my BMW