Hi Stephen,

I presume you mean for diesel models? 3 Series emissions get down as low as 99g/km for the 320d EfficientDynamics model, but the rest are 102g/km for the 316d and 318d and 106g/km for the 320d. A 330d does 129g/km, while fitting xDrive four-wheel drive pushes that up to 137g/km and the range-topping 335d xDrive does 143g/km depending on which wheels and tyres you go for. A 518d scores a 110g/km rating, a 520d 119g/km, a 525d 123g/km and a 530d 134g/km. The full-fat 535d does 138g/km. Again, those are all dependent on optional alloy wheels and tyres, which can drive the CO2 figures up a little.