Audi released the C4 (a heavily revised C3) in late 1990 in Continental Europe and during 1991 in other markets, including the right-hand drive British market.[53] The C3-platform Audi V8 continued to be sold as a separate line. The major change for the C4 was the introduction of a 2.8 L, 90-degree, SOHC 12v, V6 engine. It was later joined by a 2.6 L variant, of the same configuration as the 2.8 L unit. They are essentially the same engines offered in the 1992, B4 Audi 80. The option of quattro permanent four-wheel drive was an option across the range, except the smallest engines. The Audi 100 quattro was available with a ZF four-speed automatic and a 5 speed manual gearbox