Smart and powerful.

The straight six-cylinder petrol engine in the BMW 125i and 135i.

Delivering outstanding refinement, performance and fuel economy, the straight six-cylinder petrol engine in the BMW 125i combines exceptional power with low weight, thanks to the use of lightweight aluminium and magnesium. In the BMW 135i, the TwinPower Turbo ensures a smoother power curve, and thanks to High Precision Injection power delivery is not only explosive, but also extremely efficient. An impressive 225 kW (306 hp) propel the BMW 1 Series Convertible from 0 to 100 km/h in just 5.6 seconds.