There are 2 different A8 diesel engines available in the all new range, the big selling 3.0 V6 TDI and the larger 4.2 V8 diesel. As the A8 is all aluminium and very light weight for such a large luxury car, the fuel economy on both models is really good, being about 5 miles per gallon difference between the two. Both have a top speed limited to 155 mph, and there's only just over half a second between the cars on the 0-60 times. Horsepower levels are 250 for the 3.0 litre diesel and the 4.2 gives 350 bhp. In use the 3.0 litre Audi A8 Diesel 2013 model feels pleasantly quick, and not really lacking in any department. the 4.2 makes the car feel really quick, but a test drive is definitely advised to see if it's worth paying the extra in your opinion. Both cars are fitted with the quattro drive-train as standard - Orangewheels has some of the best discounts and deals available on the new 2013 Audi A8 Diesel for sale, just click on the model above to add your required colours and optional extra equipment to see what is the best deal and just how much you could save with our cheapest offers on a new A8 Diesel.