Lookers is shutting a Dutton Forshaw business in Maidstone.
The site's Skoda and Chevrolet dealerships will cease trading at the end of October with the loss of 60 jobs.
A Citroen franchise is being sold to another operator and will move to a new site in Maidstone.
Ongoing employment for Mercedes staff
Lookers is keeping and redeveloping the profitable Mercedes-Benz/Smart operation, along with a bodyshop.
Lookers said the Dutton-Forshaw multi-franchise operation was on an ageing site which needed substantial redevelopment.
"It is with sincere regret that the company is taking actions to close elements of the Maidstone business.
"However, the actions taken will secure ongoing employment for all staff within the Mercedes, Smart and bodyshop businesses, offering state of the art facilities to our customers.
"At the same time, Lookers will work closely with affected staff to protect as many ongoing jobs as possible."