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BMW 6-Series vs BMW I8: 5-year value retention (48% vs 48%), resale value, and cost of ownership head-to-head. BMW 6-Series holds its value better.
On five-year value retention the BMW 6-Series comes out ahead, holding about 48% of its value versus 48% for the BMW I8. Over the first five years the BMW 6-Series loses roughly $36,486 while the BMW I8 loses about $76,553 — a gap near $40,067.
First-year drop is the biggest factor: the BMW 6-Series sheds about 10% in year one versus 10% for the BMW I8. If you buy used, the steeper early drop is what the original owner absorbs.