Book a service online. Pay in advance or on the day. Our online portal, My Service, lets you get an instant quote for a service, MOT, diagnosis, or fixed price repair, then book your car in to a Mercedes-Benz Retailer at a time that suits you. Make a booking. Call me back. About Mercedes Benz C240. The Mercedes Benz C-Class of vehicles marked the beginning of what was truly a new breed of vehicles. With a V6 engine under the hood and a relatively light weight design, the C240 was afforded the ability to perform at a remarkable level while exemplifying the unmatched precision performance capability that Mercedes Benz is so well known for.