I have just ordered an A6 workshop from www.electronicmanuals.co.uk

It says: -

Audi A6 workshop manual. Covers all engine variants (petrol / diesel) and models, including the Avant, Cabriolet, Quattro and AllRoad versions, upto 2008.

This workshop manual consists of document search facilities based on VIN number, engine code and transmission code, hence allowing you to pinpoint the workshop, repair or service manual data for your exact vehicle.

Covers detailed job instructions, mechanical and electrical faults, technical modifications, wiring diagrams, service guides, technical bulletins and more.

Anyone got any experience of these?