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Mercedes-Benz SL 550
Convertible · Gasoline
vs
BMW Z4 M40i
Convertible · Gasoline
Mercedes-Benz SL 550
Car A
Mercedes-Benz SL 550
A two-seat V8 performance car with 4.6 s 0–100 km/h and a useful 300 L trunk, it suits spirited drives and weekend road trips. Limited seating and 10.1 L/100 km fuel use reduce its appeal as an everyday hauler.
2 seatsConvertibleGasoline5-star safety455 hp
BMW Z4 M40i
Car B
BMW Z4 M40i
Two-seat roadster that delivers strong performance and a premium feel, with 340 hp and 0–100 km/h in 4.5 s. Efficient for its class at 7 L/100 km, but practicality is limited.
2 seatsConvertibleGasoline5-star safety7 L/100km
Why compared same body typesame powertrainsame ranking profilesame seatsstrong ranking match

Usage fit

Family 35 / 34
City 29 / 38
Budget / value 69 / 53
Road trip 51 / 39
Performance 43 / 37
Cargo 9 / 7
Practical 23 / 26
Premium 51 / 55
Winter 30 / 26

Scores out of 100. Blue = Mercedes-Benz SL 550 · Orange = BMW Z4 M40i

Specs side-by-side

Spec Mercedes-Benz SL 550 BMW Z4 M40i
Values are representative — confirm for your market and trim.

Pros & cons

Mercedes-Benz SL 550

  • V8 punch with 455 hp and 700 Nm delivers rapid acceleration.
  • 250 km/h top speed supports confident passing and long-distance cruising.
  • 300 L trunk makes weekend luggage easy for two.
  • Good value in its segment given its performance numbers.

BMW Z4 M40i

  • Serious pace and power: 340 hp, 500 Nm, 0–100 km/h in 4.5 s
  • Efficient for its class at a combined 7 L/100 km
  • Premium roadster character suits city driving and relaxed road trips
  • 281‑liter trunk accommodates weekend luggage for two

Verdict

Pick Mercedes-Benz SL 550 if…
Lower entry price
Mercedes-Benz SL 550 starts lower, making it the stronger value pick if budget is a priority.
Pick BMW Z4 M40i if…
Performance & capability
BMW Z4 M40i is the choice if you want more power, speed, or all-weather capability.

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