2005-2011 Cadillac STS
The origins of the STS came from the Cadillac Seville, which was dropped in 2004. STS stood for “Seville Touring Sedan” and was originally a performance package for the Seville. Size-wise it fits between the Cadillac CTS and full-size DTS. The STS was rear-wheel drive based on the Sigma GM corporate platform. An STS-V performance variant was produced from 2006-2009, featuring a 4.4-Liter Northstar V8. The 3.6-Liter LY7 V6 was standard. The first generation ran from 2005-2007.
A first for Cadillac was the optional all-wheel drive available in 2006 with the 3.6-Liter V6, rated at 255hp. The optional engine was the 4.6-Liter Northstar V8 delivering 320hp. Both engines were backed by a 6L50 six-speed automatic transmission. An STS-V performance version also debuted in 2006. Bose Surround Sound incorporating navigation was standard equipment.
The 6L50 six-speed automatic transmission became standard equipment on all AWD and V8 2007 STS. Numerous chassis refinements were added, including a two-mode Magnetic Ride Control.
The 2008 STS marked the new design still based off of the Sigma platform. It came standard with a 298hp V6 with direct injection, hooked to a 6L50 six-speed automatic transmission. 14-inch Brembo brakes were available as an option. Cadillac also assembled the STS in Shanghai, China, called “SLS” from 2007-2013.
Sales dropped drastically in 2009 to only 6,037 units while the previous year saw 33,497 sales. A new “Platinum” model was introduced in 2009 with special interior and exterior additions including 18-inch alloy wheels. Lane departure and side blind zone alert systems were also available this year. This was the last year for the STS-V performance package.
For its last year the STS saw many reduced features and options. The 4.6-Liter V8 and all-wheel drive were discontinued, which also meant that adaptive steering and dampening, Magnetic Ride Control, and four-wheel active steering also were discontinued. Only 4,121 STS sedans were made in this final year.
A larger CTS introduced in 2014 succeeded the STS as Cadillac felt a need to get back into this segment.