Audi A8

Whether powering a 5,000bhp train or a 50,000bhp cruise ship, diesel engines can be mighty machines - and this is a fact that's not lost on car builders. Drivers are already reaping the benefits of high-performance oil-burners, but it looks as if Audi's latest A8 TDI will raise the benchmark.

Luxury cars are all about comfort and refinement, and Audi's latest diesel A8 delivers on both counts, with blistering performance thrown in. While many buyers will be satisfied with the 3.0 TDI's pace, the 4.2 is a true super saloon. Audi's new diesel is not only the world's most powerful turbodiesel engine, it's also the best yet.

Whether powering a 5,000bhp train or a 50,000bhp cruise ship, diesel engines can be mighty machines - and this is a fact that's not lost on car builders.

Drivers are already reaping the ben- efits of high-performance oil-burners, but it looks as if Audi's latest A8 TDI will raise the benchmark. The company claims its new flagship is the world's most powerful diesel production car - but is it torqueing the model up?

Replacing the 4.0 TDI, the 4.2-litre is 15kg lighter than its smaller predecessor. As well as the reduced weight, the unit uses the latest technology to inject fuel into the V8 at huge pressure.

The results are truly astonishing. Although it is the 321bhp power output that grabs the headlines - the 4.0 produced 50bhp less - the new V8 has incredible torque. The A8 delivers 650Nm to all four wheels between 1,600rpm and 3,500rpm. This wide band of thrust makes for effortless acceleration in any of the automatic gearbox's six ratios.

Use all the twin-turbo engine's performance, and 0-60mph takes only 5.9 seconds, with a top speed limited to 155mph. Amazingly, despite the supercar pace, Audi has also managed to improve economy and emissions.

The 4.2-litre returns a respectable 30mpg on the combined cycle, which is 0.6mpg more than the outgoing 4.0. What's more, its emissions comply with Euro IV regulations, and the 253g/km CO2 output puts the A8 in a competitive 19 per cent company car tax band.

From the wheel, the diesel demands few compromises. Refinement puts some petrol cars to shame, and occupants have to contend with minimal vibrations.

At £58,605, the 4.2 TDI is no pricier than its predecessor, but £10,240 more than the 3.0 diesel. The 4.2 petrol V8 is also less, at £57,140, but the flagship oil-burner will save high-mileage drivers a fortune in fuel costs. With huge pace and frugal economy, the top A8 diesel again raises the question of why anyone would buy a petrol luxury saloon.

Most Popular

New all-electric Hyundai Ioniq 5 arrives to take on Tesla
Ioniq 5 - front
Hyundai

New all-electric Hyundai Ioniq 5 arrives to take on Tesla

The new Ioniq 5 – the first model from Hyundai’s all-electric sub-brand – takes design influence from the 45 Concept and will be offered with two batt…
23 Feb 2021
New 2021 Mercedes C-Class gets sporty image and S-Class tech
Mercedes C-Class - front
Mercedes C-Class

New 2021 Mercedes C-Class gets sporty image and S-Class tech

The fifth-generation Mercedes C-Class features a range of petrol, diesel and plug-in powertrains, with high performance AMG models set to follow in 20…
23 Feb 2021
New supermini-sized SEAT and Cupra EVs to slot beneath Born hatch
Cupra
News

New supermini-sized SEAT and Cupra EVs to slot beneath Born hatch

Spanish brands plan to launch a smaller electric hatchback which will share underpinnings with the upcoming Volkswagen ID.1
22 Feb 2021