Not so very long ago, the idea of a diesel engine in a coupe would have been considered sacrilege. Not any more, and as if to underline the point, the 2 Series Coupe is available with a 2.0-litre four-cylinder diesel with 141bhp, 188bhp and 215bhp outputs, badged 218d, 220d and 225d respectively. The 220d is the most popular seller, and offers sufficient performance to give many a hot hatch a run for its money, so you need to ask yourself some serious fiscal questions before forking out the substantial premium for the 225d. It is worth ticking the option box for the excellent eight-speed automatic gearbox (standard on the 225d), however. With an almost Jekyll and Hyde duality, the shifts are near seamless during everyday motoring, but when you demand some extra oomph, it kicks down the gears with a snappy shunt to hook up the engine’s gutsy performance. Unfortunately, the diesel engines are not the most refined, both at idle and when asked to rev hard. With plenty of audible combustion cackle and a fair bit of vibration resonating through the floor, steering wheel and pedals, they fall well short of the standards set by the Audi TT, or for that matter, many diesel engines found in less illustrious models, such as the Mazda 3. Just like the diesels, the petrol engines are all turbocharged and include a 1.5-litre three-cylinder unit, and a 2.0-litre four-cylinder engine that comes in two power outputs. It’s the top trump 240i that really shakes the tree, though. Employing BMW’s pride and joy 3.0-litre straight six-cylinder engine; as well as being smoother than honey, it develops a tyre-torturing 335bhp and 368lb ft of torque, giving the Coupe some seriously bad-boy performance.