Hyundai Sigma engine
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