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
Luxury vehicle produced in North America (such as BMW Spartanburg) instead of the luxury marque's home country. Some of these models were not traditional SUVs based on light trucks, rather they are classified as crossovers using unibody constructions. SUVs from non-luxury brands had experienced a surge in popularity through early 2000s, causing the traditional luxury marques to follow. SUVs from the luxury marques grew at almost 40 percent to more than 430,000 vehicles, excluding SUV-only brands like Hummer and Land Rover, while luxury car sales in the U.S. during 2003 suffered a 1% decline, and non-luxury SUV sales were flat. By 2004,