The transfer gearbox in the AWD models — the same as used in the Vauxhall Cavalier AWD—was somewhat on the flimsy side, liable to suffer damage from conditions such as minor differences in tyre wear or tyre pressure between front and rear axles. Since front and rear tyres would naturally wear at different rates in normal driving, it was necessary to swap front with rear tyres every 15,000 miles (24,000 km).
The Kadett C appeared in August 1973 and was Opel's version of the General Motors' "T-Car". It was the last small Opel to feature rear-wheel drive, and remained in production at Opel's Bochum plant until July 1979, by which time Opel had produced 1,701,076. Of these, 52% had been exported outside West Germany, most of them to markets in other parts of western Europe.
1938 saw the presentation of the highly successful Kapitän. With a 2.5 L six-cylinder engine, all-steel body, front independent suspension, hydraulic shock absorbers, hot-water heating (with electric blower), and central speedometer. 25,374 Kapitäns left the factory before the intensification of World War II brought automotive manufacturing to a temporary stop in the Autumn of 1940, by order of the government.