Every diesel A6 is efficient and economical compared with rivals, and strong resale values help to make most models sensible choices. Prices are competitive, too.
The 2.0 TDI Ultra is the standout version, though. It promises to be about as cheap as it gets for company and private buyers in this class, given its low CO2 emissions, slow depreciation and tempting contract hire and PCP finance deals. The automatic version also achieved 45.9mpg in our real-world True MPG tests; this isn’t as good as a BMW 520d’s result, but is still good for such a big car.
Although the six-cylinder diesel models stack up well against their similarly powerful rivals, they cost significantly more to buy and run than the four-cylinder Ultra, so don’t make as much financial sense.
The S6 will be extremely expensive to keep on the road, but then that’s the price you pay for its storming performance.
Service intervals are up to a maximum of every two years or 19,000 miles, which helps keep servicing bills manageable.