Terrain Denali, 4D Sport Utility, 3.6L V6 SIDI, 6-Speed Automatic, AWD, Carbon Black, and NAVIGATION. Drive this home today! Best color! Tired of the same tedious drive? Well change up things with this outstanding 2013 GMC Terrain. This Terrain's engine never skips a beat. It's nice being able to slip that key into the ignition and not having to cross your fingers every time.