All engines were mated to catalytic converters, which required use of unleaded gasoline and spelled the end of true dual exhausts. With economy now a selling point following the 1973–74 energy crisis resulting from the Arab Oil Embargo, the '75 4-4-2 and most other Cutlass models no longer included a V8 engine as standard equipment. For the first time since its 1964 introduction, the 4-4-2 came standard with a six-cylinder engine, Chevrolet's 250 cubic-inch inline unit which had previously been offered on some Olds intermediates from 1966 to 1971 and the compact Olds Omega since its 1973 introduction. Also new this year was a small Olds-built 260 cubic-inch Rocket V8 specifically designed for fuel economy. The 170-horsepower 350 Rocket V8 was now an extra-cost option along with the 190-horsepower 455 V8. A three-speed manual transmission was reinstated as standard equipment with the six-cylinder engine with the Turbo Hydra-matic transmission optional with that engine and the only transmission offered with the V8 engines. Interiors again consisted of bench seats with cloth-and-Moroceen vinyl or all-Moroceen trim, or optional swiveling Strato buckets upholstered in Moroceen vinyl. Revised door panels featured pull straps. Console optional with bucket seats.