The Lexus GS is a mid-size luxury sports sedan / executive car manufactured by the Toyota Motor Corp. under the Lexus brand and sold as the Toyota Aristo in Japan. Based on the platform and running gear of the Toyota Crown, it was introduced in 1991 in Japan and two years later in the United States, Europe and selected markets in Asia. The model was designed to fill the gap between the ES and LS and to provide Lexus with a sports sedan that could compete with the BMW 5-Series and the Mercedes-Benz E-Class. For most of its life, the GS had a wider wheelbase than the ES, and was shorter than the ES in length.
Though essentially identical, GS and the Aristo differ in their engine and transmission combinations as well as equipment packages.
The third generation GS was first sold in 2005 as a 2006 model, with the chassis codename GRS190. The model lineup included the GS 300, with a 3.0 L V6 3GR-FSE engine, and the GS 430 with the same 4.3 L V8 used in the previous model. The GS 300 has a direct-injection engine for all markets except for Continental Asia. The 3.0 L engine is also found in the Toyota Mark X as well as the Zero Toyota Crown. A 4WD option was made available in the GS300 only.
A GS 350, using the 3.5L 2GR-FSE engine, replaced the GS 300 for the 2007 model year. A 4.6L GS 460 is expected to replace the 4.3L GS 430 by 2008. Production of the 3rd generation began on January 24, 2005.
The equivalent Aristo was not released as Toyota sought to align all world markets, including Japan, using Lexus as their premium brand worldwide.