BMW Z4 M40i
Convertible · Gasoline
vs
Mercedes-Benz SL 400
Convertible · Gasoline
BMW Z4 M40i
Car A
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/100km340 hp
Mercedes-Benz SL 400
Car B
Mercedes-Benz SL 400
The Mercedes-Benz SL 400 focuses on premium, two-seat touring with strong performance from a 333 hp V6 and swift 0–100 km/h in 5.2 s. It favors power and road-trip usability over family practicality.
2 seatsConvertibleGasoline5-star safety
Why compared same body typesame powertrainsame ranking profilesame seatssame usage profilestrong ranking match

Usage fit

Family 34 / 27
City 38 / 21
Budget / value 53 / 22
Road trip 39 / 52
Performance 37 / 39
Cargo 7 / 12
Practical 26 / 15
Premium 55 / 68
Winter 26 / 30

Scores out of 100. Blue = BMW Z4 M40i · Orange = Mercedes-Benz SL 400

Specs side-by-side

Spec BMW Z4 M40i Mercedes-Benz SL 400
Values are representative — confirm for your market and trim.

Pros & cons

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

Mercedes-Benz SL 400

  • Strong performance from a 333 hp V6 with 5.2 s 0–100 km/h
  • Suited to premium and road-trip use, with a 355 L trunk for weekend bags
  • Efficient for its class with 7.3 combined consumption
  • Strong safety ranking within its set

Verdict

Pick BMW Z4 M40i if…
Best fuel economy
BMW Z4 M40i uses 7.0 L/100km vs 7.3 — a meaningful saving if you cover high mileage.
Pick Mercedes-Benz SL 400 if…
Performance & capability
Mercedes-Benz SL 400 is the choice if you want more power, speed, or all-weather capability.

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