BMW 4 Series vs BMW 6 Series Compare price, expert/user reviews, mpg, engines, safety, cargo capacity and other specs at a glance.

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2025 BMW 4 Series 2.0 420i M Sport (Pro Pack) Convertible 2d
Photo of 2020 model year shown

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2021 BMW 6 Series 2.0TD 620d M Sport
Photo of 2018 model year shown

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Specs

2025 BMW 4 Series
2.0 420i M Sport (Pro Pack) Convertible 2d
2021 BMW 6 Series
2.0TD 620d M Sport
Powertrain 8-speed Automatic 8-speed Automatic
Drivetrain
RWD
RWD
Fuel economy, city -- --
Fuel economy, motorway -- --
Fuel tank volume 223 L 250 L
Engine
Fuel type
Petrol
Diesel
Power
135 kW
140 kW
Torque
366 N-m @ 4,600 RPM
542 N-m @ 1,750 RPM
Cylinders
4 cylinders
4 cylinders
Engine size
1,998 cc
1,995 cc
Interior
Maximum seating 4 seats 5 seats
Front legroom -- --
Rear legroom -- --
Exterior
Length 121.11 m 129.31 m
Width 52.86 m 54.81 m
Height 35.15 m 39.07 m
Wheelbase 72.42 m 77.98 m

Available Options

2025 BMW 4 Series
2.0 420i M Sport (Pro Pack) Convertible 2d
2021 BMW 6 Series
2.0TD 620d M Sport

Related Comparisons

2025 BMW 4 Series
2.0 420i M Sport (Pro Pack) Convertible 2d
2021 BMW 6 Series
2.0TD 620d M Sport