Cadillac offers four versions of the DTS, all with a powerful 4.6L V8 under the hood that makes 275 horsepower. The top-level Platinum edition squeezes out a few more horsepower for a rating of 292. All versions feature a 4-speed automatic transmission with overdrive, plus 4-wheel anti-lock brakes, StabiliTrak stability control, traction control and tire pressure monitoring. Rear parking assist is standard on all but the base DTS. In addition to active safety systems, driver and passenger-sensing air bags are standard. The 2011 Cadillac DTS offers GM's OnStar assistance as standard equipment. OnStar will automatically notify emergency personnel in case of a crash, unlock the doors remotely, diagnose vehicle issues and provide roadside assistance if needed. Plenty of amenities are standard across the lineup. Remote keyless entry, power locks and power heated mirrors, performance tires and high-intensity discharge xenon headlights come on all DTS models. The interior features leather seating surfaces, power front seats, dual-zone climate control, cruise control and a CD sound system. Some features, such as heated front seats are available on the base DTS and standard on the Luxury, Premium and Platinum models. The Luxury edition also adds a sunroof, rear heat ducts and Bluetooth connectivity, while the Premium has wood trim, an upgraded sound system from Bose, navigation system and side mirrors with integrated turn signals. The performance aspects of the DTS Platinum go beyond the exterior chrome-- it also features an active suspension system. The Side Blind Zone Alert system and Lane Departure Warning are available at the Premium level and standard on the Platinum.