The upgrade is far from essential – straight-line punch was never something the M140i lacked – but even in this modified state the B58 in-line six has a beautifully smooth delivery that lets ...

The successor to the impressive M135i and M235i now has more power, more torque and is called the M140i and M240i. The new engine is still a 3-litre straight six with a twin scroll turbocharger ...