Cogent has retained the Vauxhall Network Q creative account following a competitive pitch held 29 years after they first started working together.
Network Q is Vauxhall's approved used cars brand and was created by Midlands marketing agency Cogent in 1990.
"Since creating the brand almost 30 years ago, Cogent has remained a seamless extension of our in-house team," said Clare White, national brand manager for used vehicles at Vauxhall Motors.
On staying in the driving seat into a third decade, Cogent chief Bruce Hutton said: "A 29-year client relationship with such an icon of the UK automotive industry is a real badge of honour for us and a great example of togetherness in action. Here’s to the 30th birthday celebrations next year."