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BMW M3 vs Porsche 718 Boxster: 5-year value retention (85% vs 86%), resale value, and cost of ownership head-to-head. Porsche 718 Boxster holds its value better.
On five-year value retention the Porsche 718 Boxster comes out ahead, holding about 86% of its value versus 85% for the BMW M3. Over the first five years the Porsche 718 Boxster loses roughly $11,175 while the BMW M3 loses about $11,578 — a gap near $403.
First-year drop is the biggest factor: the Porsche 718 Boxster sheds about 0% in year one versus 8% for the BMW M3. If you buy used, the steeper early drop is what the original owner absorbs.