The Hyundai Sigma engine is a series of V6 piston engines from Hyundai Motor Company, based on the Mitsubishi 6G7 engine. The Sigma engine family began life with the simple V6 name. Displacement ranges from . 2.5L (G6AV) The DOHC G6AV (also called the 2.5 D) is the small version. Bore is and stroke is shared with the at . Output is at 6,000 rpm and at 4,500 rpm. Applications Hyundai Dynasty (1997–2005) Hyundai Grandeur (LX) (1995–1998) Hyundai Marcia (1995–1998) 3.0L (G6AT/G6CT) The DOHC G6AT and G6CT (also called the 3.0 D) both displace . They share the 2.5's stroke but use a larger bore. Output for the older G6AT is at 6,000 rpm and at 4,000–4,500 rpm, while the G6CT produces at 5,500–6,000 rpm and at 3,500–4,000 rpm. The older SOHC G6AT 3.0 S produces just at 5,000 rpm and at 2,500–3,000 rpm. Applications Hyundai Dynasty (1996–2005) Hyundai Equus (LZ) (1999–2005) Hyundai Galloper (1994–2000) Hyundai Grandeur (1989–2005) Hyundai Sonata (Y3) (1990–1998) Hyundai Starex (A1) (1999–2003) Hyundai XG300 (2001) Kia Opirus (2003–2006) 3.0L LPG (L6AT) The L6AT displace . They share the 2.5's stroke but use a larger bore. Output is at 4,500 rpm and at 2,500 rpm. Applications Hyundai Galloper (1998–2003) Hyundai Libero (2000–2007) Hyundai Starex (A1) (1999–2003) 3.5L (G6AU/G6CU) The G6AU and G6CU (both also called the 3.5 D ) are the large versions of the Sigma engine. Bore and stroke are both larger at , respectively. Output is at 5,500 rpm and at 4,000 rpm for the older G6AU and at 5,500–6,000 rpm and at 3,500 rpm for the newer G6CU. The 3.5 D has a cast iron engine block and aluminum DOHC cylinder heads. It uses Multi-port fuel injection, has 4 valves per cylinder, and features forged steel connecting rods. It is designed to run on "regular" unleaded gasoline rather than the premium fuel used in many other high-output V6 engines. The US-market version produces at 5,500 rpm with of torque at 3,500 rpm. It was introduced with the Kia Sedona minivan in 2001. Applications Hyundai Dynasty (1996–1999) Hyundai Equus (LZ) (1999–2005) Hyundai Grandeur (1994–1996, 2002–2005) Hyundai Santa Fe (SM) (2002–2005) Hyundai Terracan (2001–2007) Hyundai XG350 (XG) (2002–2005) Kia Opirus (2003–2006) Kia Sedona (GQ) (2001–2005) Kia Sorento (BL) (2003–2006) See also List of Hyundai engines Mitsubishi 6G7 engine Sigma V6 engines Gasoline engines by model