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Well, the 6 cyl in the 45e is one of the most reliable BMW has made, and BMW is known for its inline sixes, not little 4 bangers like in the 40e and some older hybrids. I believe the battery tech is 4th gen for BMW so it's not new stuff. They're really restricting how much of the battery you can actually use cuz they have an 8 yr warranty in the US. I plan on keeping it for 10 yrs too and I don't foresee any extraordinary problems compared to the 40i.
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