Audi A6 3.0 TDi quattro

3.0-litre turbo-diesel, six-speed auto
Four-door sedan
Price: $97,900

Best features

• Pricing 
• Fuel consumption
• Comfort
• Build quality and finish

Diesel derivatives have come of age in the passenger car market with a breakthrough Best Cars victory. The new breed of cutting-edge turbo-diesel engines powers the Audi A6 TDi, a leading brand in a predictably German-dominated class.

This engine leaves a lasting impression on performance with terrifi c thrust from low revs and an automatic that masters the diesel’s characteristics cleanly and capably. Banish thoughts of diesel noise too, as engine clatter is well concealed.

The other advantage is fuel economy; this Audi has an offi cial combined figure of 8.5l/100km. Understand though, that diesel is a pricey product and diesel engines emit more air pollution than their petrol peers.

Audi’s effort in A6 design and functionality is laudable. This car demands recognition for its safety, security, comfort, ergonomics and build quality. Its space and practicality are also of a high standard.

The A6’s light steering may not garner universal appeal, however, a glut of grip, nice balance and the quattro all-wheel-drive system all count in its favour. Powerful brakes also serve this sedan well. It is a firmer ride than some compliant contemporaries but its bump absorption rarely intrudes.

Even though monetary matters are not highly rated, the A6 TDi presents a good case. Its pricing is better than average and the outlook on depreciation losses is positive.

A new heart boosts the Mercedes-Benz’s E350; coupled to a silky seven-speed automatic gearbox it now has the measure of its rivals on the road. It is tough to match the creamy ride on offer in the E Class and few owners will ever plumb the depths of its handling or braking prowess. It excels for safety, comfort and build quality, while its environment score is the best of this breed. However, it doesn’t dominate on ergonomics or practicality, and its value is less robust.

BMW’s sporty 530i shares many comfort, build and braking qualities with the top two cars. It falls behind on safety and performance though, and is further handicapped by a weak warranty and practicality problems.