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1) it's condition based servicing so the ecu should tell you when. If you go through the vehicle information menu in the I drive it tells you when the different service items are due.
2) You may invalidate your warranty
3) not sure
4) it can be retrofitted , there are posts of people doing this. I would just get a tom tom though it's not worth the cost.
5) depends where you are in the world and what you want.
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