From 2005 until 2011 Cadillac introduced the STS which established major changes in their engineering strategies for luxury sedan production. The Cadillac STS used GM's Sigma platform while providing customers the choice between a 3.6L V6 (LY7/LLT) and a 4.6L Northstar V8 (LH2) performance engine. The Cadillac STS gained better driving capabilities because it advanced from the 5-speed 5L40-E automatic transmission to the 6-speed 6L50 automatic transmission. Customers seeking this luxury sedan model chose between rear-wheel drive (RWD) as standard along with the option to choose all-wheel drive (AWD) for better traction capabilities. The model achieves enduring ride performance because it has a wheelbase measurement of 116.4 inches with a curb weight that reaches 3,922 pounds. The model excels in safety tests leading to its recognition as a safety-focused car. The Cadillac STS includes high-grade genuine parts which provide excellent durability because of its reliable construction. The STS keeps its reputation for excellence because Cadillac continues to upgrade its original equipment manufacturer components throughout the years. The Cadillac STS stands out in the Cadillac lineup with its blend of premium materials and advanced engineering thus attracting customers who want luxurious experiences combined with performance capabilities.