Webuyanycar is handing out 10,000 packs of watermelon-flavoured Millions across its 550-plus branches to mark reaching five million customers.
The giveaway includes its five Oxfordshire branches, with the public invited to take part regardless of whether they are selling a car.
Louise Badham, marketing director at webuyanycar, said: “It’s been a big year for webuyanycar – we turned 20 in March, and now we’ve welcomed our five millionth customer.
“We wanted to mark this milestone with something fun, and a way of saying thank you to everyone who’s been part of the journey over the last two decades.”
The celebration also includes a chance to win £2,500 in cash, with five winners each receiving £500.
To enter, participants simply need to share a photo of their commemorative sweets and tag webuyanycar on social media.
Ms Badham said: “Twenty years in this industry has taught us a lot, but our principles haven’t changed: the fastest way to sell your car, with certainty guaranteed and fairness built in.
“It’s a real privilege that five million people across the UK have trusted us with their motors.”
Free packs will be available from Monday, September 21 at branches in Banbury, Bicester, Didcot, Oxford Seacourt, and Witney, while stocks last.
The giveaway is part of a wider week of celebrations, including fuel voucher prizes on social media.
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