Audi A6 ALLROAD QUATTRO Pricing And Specification Manual page 12

It means that the A6 allroad can 'read'
the road, sensing changes in the surface
beneath the wheels and adjusting their grip
accordingly. So when conditions get a little
more demanding – in particular, when you
go off-road – quattro® adapts, putting all
the force of the A6 allroad's engine precisely
where it's needed to handle the change
in terrain.
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