Several Audi prototypes – including A6, A6 Avant and RS6 Avant - were spotted recently conducting winter testing.

Audi seems to be working on a nip and tuck for the entire A6 range and based on these spy shots the changes will be minimal, at least on the exterior where the visual upgrades will be kept down to the minimum in typical Audi style. More significant modifications will be inside the cabin where the A6 will likely get more tech goodies.

Engine lineup will probably be carried over from the current model, including the recently introduced 190 HP 2.0-liter 4-cylinder in the frugal Ultra variant which returns 51.1 mpg US (61.4 mpg UK or 4.6 liters / 100 km).

The facelifted Audi A6 lineup will probably come out before the end of the year.

Gallery: Audi A6 and RS6 Avant facelifts spied testing together

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