Vauxhall retailers will be making an extra 2,300 cars available in the UK from the beginning of April until the end of June to cater for the extra demand.
Models across the range will be on offer, including the newly-launched Astra Sport Hatch and the Breeze editions of Corsa, Meriva, Astra, Zafira and Vectra.
Across Europe around 35,000 test cars will be made available in 40 European countries, and a total of more than a million miles are expected to be driven by potential customers in the three-month campaign.
Vauxhall van retailers will also be taking part in the giant sales initiative, and the whole of the commercial vehicle range will be available as part of the programme. Eligible business customers will be offered test drives in Corsavan, Astravan, Combo, Vivaro and Movano models.
The UK programme will run until the end of June.