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Cadillac CT5 holds its value better — 69% five-year retention against 68% for the BMW M4. Resale value and cost of ownership, head to head.
On five-year value retention the Cadillac CT5 comes out ahead, holding about 69% of its value versus 68% for the BMW M4. Over the first five years the Cadillac CT5 loses roughly $15,203 while the BMW M4 loses about $25,153 — a gap near $9,950.
First-year drop is the biggest factor: the Cadillac CT5 sheds about 4% in year one versus 7% for the BMW M4. If you buy used, the steeper early drop is what the original owner absorbs.