The £1m transformation of Motorworld's Audi dealership in Kidlington is nearing completion.
Now a stand-alone Audi operation, the building work was planned in phases to allow trading to continue.
Staff will move into the showroom, to be known as Oxford Audi, at the end of February. Opening celebrations are planned for mid-March.
The launch coincides with the arrival of the new Audi A4 saloon, a significant compact executive model for the German car-maker.
Brand manager Adam Stanley said: "It has been business as usual, though we are a little tight for space at the moment. The workshop is complete, so we can handle all servicing and repair work."
Group general manager Alf Middleton said the dealership was one of Audi's longest-established operations.
He added: "We are delighted to provide customers with a superb facility that reflects the quality and innovation of Audi's product range."
The development follows Motorworld's £2.5m investment in a purpose-built VW dealership in Langford Lane, Kidlington.
Demolition of the showroom frontage uncovered old signs showing the names of Audi, Volkswagen and NSU cars, all sold from the site during the 1970s.
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