HIGH-pressure fuel injection and lightweight materials have done a lot to transform the diesel engine in passenger cars, and nowhere is this so clearly evident than in the BMW 330d. This is the car that will convert many a petrolhead to the delights of distillate power. Or its torque, really, because the 520Nm on tap at just 1750rpm in a car weighing 1500kg makes for assertive acceleration, and it’s refined with it.