Marvin Diekevers and Delmar Stange owned the D&S Chevrolet used car lot on Highway 18 from 1964-2000. (Photo/Sioux County Index-Reporter archives) Delmar Stange, left, and Marv Diekevers show a Chevrolet Caprice at their new car showing in 1985. This was Diekever’s 39th new car showing and the 36th for Stange. (Photo/Sioux County Index-Reporter archives) The…