Trim levels were expanded, and were designated the Brougham, SGL Extra, SGL, GL and the Jack Nicklaus edition which was very similar to the Brougham, which offered the turbo. Other trim levels were the Turbo S, Custom S, Custom Deluxe, Deluxe and the Standard at the bottom. The diesel engine SD22 was offered in 1979 on the sedan GL and DX. The Standard Sedan and Van were discontinued April 1981. October 1979, the 6-cylinder LD28 diesel was added with the automatic transmission selector moved from column shift to a floor-mounted system. December 1979 was when the first turbo L20ET was introduced,