The second series of the Opel Diplomat went into production in 1969. The car was initially equipped with the 5303cc V8 engine, which had been fitted to the I series starting from September 1966. From January 1972 the 2.8-cylinder 6-cylinder engine was also available. liters with injection, combined with an automatic transmission. In September of the same year, the aesthetics were slightly changed with a new front that included the brand symbol. From May 1973 a version with an extended 150mm wheelbase was also available. Production stopped in 1977.