The heavier part of the F-engined range was split into two in September 1959, with the FA80 and FA90 being built to handle respectively; these model codes were again maintained until the first generation was replaced. In March 1957 the diesel-engined DA60 was introduced. The all new "D" engine was a pre-combustion diesel straight-six displacing and producing at 2600 rpm. The DA60 also prompted Toyota to introduce the new Toyota Diesel Store sales network, which remained until 1988 and was the exclusive distributor of Toyota's diesel-engined vehicles in Japan. This became the DA70 at the beginning of 1958. As with the petrol-engined models, the diesel lineup was split into the 5-tonne DA80 and the 6-tonne DA90 in September 1959. Unlike the petrol-engined models, however, the 6-tonne diesels also received a new, larger and more powerful engine. The 2D displaces and produces . There were also the long-wheelbase DA95/FA95, with between the axles. Some diesel-engined models carry an "H" suffix (such as a DA90-H); this signifies a model with a two-speed rear axle, giving a total of eight forward speeds. In late 1959 the lineup was refreshed and the grille was changed to incorporate two yellow marker lights. In late 1961 (for the 1962 model year) the range was facelifted again, with a single-piece curved windshield replacing the earlier split unit. This was Japan's first heavy truck with such a fitment. At the same time, the grille was stamped directly with widely spaced "TOYOTA" lettering rather than having chromed letters mounted to a red bar as earlier. With the sales of bonneted trucks slowing down in Japan at this time, reflecting ever more congested city streets, Toyota developed a cab-over version on a wheelbase. Based on the medium-duty FC80 model, the new DC80C was presented in October 1963, fitted with the D-type diesel engine and a tilting cab. As with the bonneted models, the 5.9-liter D-type six-cylinder engine develops . Because the engine was mounted between the seats, the cabover model could only take two occupants. The DC80C initially sold very well, but problems with the drivetrain as well as the chassis meant that it soon lost out to its competitors. At the same time as the DC80C, the petrol-engined FC100C with was also introduced.