Toyota Mark X late 1960s. Instead of being based on a modified Supra chassis "A" series platform, the Mark X continues to use the Toyota "X" platform, and does not share its platform with the Toyota "S" series platform used under the Toyota Crown and the Lexus GS. The continuation of describing this vehicle as the "X" series is a reference to the first dedicated Mark II platform introduced in 1972. Major changes to the Mark series are the engine and footwork. Toyota discontinued the straight-six engines used in the Toyota Verossa, which included the JZ series and the G series engines, and
Toyota Crown Toyota Crown The is an automobile which has been produced by Toyota in Japan since 1955. It is currently a line of mid/full-size luxury sedans primarily aimed at the Japanese market and sold in other select Asian markets. Introduced in 1955, it has served as the mainstream sedan from Toyota in the Japanese market throughout its existence and holds the distinction of being the longest-running passenger-car nameplate affixed to any Toyota model, along with being the first Toyota vehicle to be exported to the United States in 1958. Its traditional competitors in Japan and Asia have been the Nissan Cedric/Gloria/Fuga