In the 1930s through the 1990s, Oldsmobile used a two-digit model designation similar to that used by the European makes today. As originally implemented, the first digit signified the body size while the second represents the number of cylinders. Body sizes were 6, 7, 8, and 9, and 6 and 8-cylinder engines were offered. Thus, Oldsmobiles were named 66 through 98.
