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BMW M4 vs Cadillac CT5: 5-year value retention (70% vs 69%), resale value, and cost of ownership head-to-head. BMW M4 holds its value better.
On five-year value retention the BMW M4 comes out ahead, holding about 70% of its value versus 69% for the Cadillac CT5. Over the first five years the BMW M4 loses roughly $24,825 while the Cadillac CT5 loses about $15,203 — a gap near $-9622.
First-year drop is the biggest factor: the BMW M4 sheds about 0% in year one versus 4% for the Cadillac CT5. If you buy used, the steeper early drop is what the original owner absorbs.