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Not that much really. That V12 is solid, as long as u didnt miss the regular servicing it'll be fine.
You may be suprised to know that the straight 6 bmw engines of the 90s actually require more maintenance than the 12.
The only thing to watch and possibly be concerned about with the 7s is electronics.
it has a stack of receipts in the car from checkard flag on all the maintenence....about 8-9 grand worth... should be fine for a good while....as far asb gas goes...depends how you drive it...5-23 mpg