BMW 3 series engine produces 7 HP more power than Mercedes C class, but torque is 10 NM less than Mercedes C class.
Fuel consumption
Fuel consumption (l/100km):
7.4
7.3
Real fuel consumption:
8.2 l/100km
8.5 l/100km
By specification BMW 3 series consumes 0.1 litres more fuel per 100 km than the Mercedes C class, which means that if you drive 15,000 km in a year, the BMW 3 series could require 15 litres more fuel. But when we compare the real fuel consumption reported by users, BMW 3 series consumes 0.3 litres less fuel per 100 km than the Mercedes C class.
Fuel tank capacity:
61 litres
66 litres
Full fuel tank distance:
820 km in combined cycle
900 km in combined cycle
1030 km on highway
1110 km on highway
740 km with real consumption
770 km with real consumption
Mercedes C class gets more mileage on one fuel tank.
Engines
Engine production duration:
12 years
19 years
Engine spread:
Installed on at least 6 other car models, including BMW 5 sērija, BMW X5, BMW 7 sērija, BMW X3, BMW X6
Installed on at least 10 other car models, including Mercedes E klase, Mercedes ML, Mercedes S klase
In general, the longer and for more car models an engine is produced, the better its serviceability and availability of spare parts. Mercedes C class might be a better choice in this respect.
Dimensions
Length:
4.52 m
4.58 m
Width:
1.82 m
1.77 m
Height:
1.42 m
1.45 m
BMW 3 series is 6 cm shorter than the Mercedes C class, 5 cm wider, while the height of BMW 3 series is 3 cm lower.
Trunk capacity:
460 litres
475 litres
BMW 3 series has 15 litres less trunk space than the Mercedes C class.
Turning diameter:
11 meters
10.8 meters
The turning circle of the BMW 3 series is 0.2 metres more than that of the Mercedes C class.
Mercedes C class has slightly fewer faults. Deffect rate in annual technical inspection is similar for both cars, it's slightly higher for BMW 3 series, so Mercedes C class quality could be a bit better.
