F103 is the internal designation for a series of car models produced by Auto Union in West Germany from 1965 to 1972, derived from the earlier DKW F102.

To signify the change from a two-stroke to four-stroke engine, the DKW marque was dropped in favour of Audi, a name that had been dormant since before the Second World War.

To avoid this, it was often recommended to run a hotter spark plug (with a lower heat range) in the front cylinder than in the other three.

They were dubbed the Mitteldruckmotor (medium-pressure engines) because of their unusually high BMEP (mean effective pressure, as calculated from brake torque) values, which led to a good thermodynamic efficiency.

Inboard mounted front disc brakes were featured,[2] which was still unusual in the mid-size car market at this time.

Making its debut at the Geneva Motor Show in March 1966,[3] this was called, like the Volkswagen estate/station wagon models, Variant.

The fuel filler moved from its location to the right of the license plate on the rear panel to a position on the right hand wing of the car, and following a general trend of the period was now shielded by a flap that was flush with the bodywork.