Motors is rebranding its advertising business as Cazoo, effective 27 May, and will close its website later this year.
A phased migration to a single platform will maintain traffic and protect lead volumes.
Barry Judge, CEO of Cazoo & Motors, said: “Cazoo is already the second best known used car marketplace in the UK, with 60% consumer awareness. Our mission is to disrupt the market and provide dealers and car buyers with a credible alternative to the market leader.
“We will consolidate our efforts entirely behind Cazoo and transition our investment and traffic from Motors into the Cazoo marketplace. By focusing our efforts in one place, we will move even faster, innovate more effectively and deliver stronger outcomes for dealers and car buyers, with higher-quality demand and improved lead volumes.
Dealers have been notified there will be no changes to how they list or manage their vehicles.
Judge added: “This is not a decision we have taken lightly. It is one that has been informed by extensive testing, learning and analysis.
“Cazoo is the only credible challenger to the market leader, with all our resources supporting its growth towards becoming an outstanding alternative marketplace for dealers and buyers.”