I have carried a 2018 B7 and 2020 M760 for 6 months together, the B7 was turned in but over the time I have owned both cars (45K miles on the B7) I have had a look at the dealer numbers for repairs.. They are essentially a wash in terms of cost when something needs to be done, however as others said the B7 does run more to the limit, which the 760 has a lot of room... My B7 required some turbo, engine, and transmission work, because I do drive all the cars I own hard.. The M760 has been tuned by G-Power and even then the car is never shown a hint of an issue...
With that said I miss the B7 so just ordered another and will be moving the M760 in the coming weeks (lease assumption)... Under warranty I don't really worry about it, although I would keep an M760 out of warranty I am not sure I would carry a B7 with above 50K miles..
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2021 Alpina XB7 - Alpina Blue
2022 M5 CS - Frozen Gray
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