September 13, 2026
BMW M3 vs Mercedes-AMG C63 S: Which Costs More to Actually Own?
On paper, this is a coin flip. The BMW M3 stickers at $77,195. The Mercedes-AMG C63 S stickers at $76,200. A thousand dollars apart at the dealer. But the window sticker is the least honest number in car buying, so we ran both through the full 5-year ownership model. The result is not close.
The numbers
| BMW M3 | Mercedes-AMG C63 S | |
|---|---|---|
| MSRP | $77,195 | $76,200 |
| Horsepower | 473 | 671 |
| 5-year true cost (new) | $140,817 | $122,270 |
| Monthly true cost | $2,347 | $2,038 |
| Insurance range | $2,700-$5,600/yr | $2,600-$3,700/yr |
| Maintenance | $3,764/yr | $1,400/yr |
| Fuel economy | 19 mpg | 20 mpg |
| 5-year true cost (used) | $135,263 | $92,816 |
The C63 S costs $18,547 less than the M3 over five years, or about $309 less every month. And here is the twist: the cheaper car to own has 671 horsepower to the M3's 473. More power, lower true cost. Sticker prices told you nothing.
Where the gap comes from
Two line items do most of the work. First, maintenance: the M3 runs about $3,764 a year against the C63's $1,400. M cars consume tires, brakes, and fluids at a ferocious rate, and BMW M maintenance pricing is simply steeper. Second, insurance: the M3's range tops out at $5,600 a year versus $3,700 for the C63. Depreciation also favors the Benz slightly, with the C63 shedding value a little faster in percentage terms but from a lower running-cost base.
The used market blows it wide open
Buying used 2 to 4 years old, the gap becomes a chasm: $135,263 for a used M3 versus $92,816 for a used C63 S over five years. That is a $42,447 difference. Used C63s depreciate harder than used M3s, which punishes the first owner and rewards you.
The bottom line
If you cross-shop these two on sticker price alone, you will conclude they cost the same. They do not. The C63 S is the dramatically cheaper car to actually live with, new or used, while giving up nothing on power. The M3 counters with sharper handling and stronger resale, but it charges you $309 a month for the privilege.
Compare them head to head M3 full breakdown
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Figures are estimates based on national averages and our standard assumptions (10% down, 60-month loan at 7% APR, 12,000 miles/year). Data last updated September 2026.