The W110 was Mercedes-Benz’s entry level line of midsize automobiles in the mid-1960s. W110 initially was available with either a 1.9 L gasoline or 2.0 L diesel inline-four . The W110 line was refreshed in July 1965 to become the 200 and Diesel 200D, at the same time, a six-cylinder 230 (successor to the Mercedes 220) became part of the W110 line. Production lasted just three more years. The W110 and the 6-cylinder W111 were the first series of Mercedes cars to be extensively crash tested for occupant safety.