Duramax I6 engine

See also: Duramax

The Duramax I6 engine is a diesel engine available in select models of General Motors light-duty trucks and SUVs. Applications include the Chevrolet Silverado/GMC Sierra 1500, Chevrolet Suburban/GMC Yukon XL, Chevrolet Tahoe/GMC Yukon, and Cadillac Escalade (both short wheelbase and ESV). The engine was developed together with Opel, who are manufacturing three- and four-cylinder versions displacing 1.5 and 2.0 liters, using the same engine architecture.

Duramax I-6
Overview
Also called	LM2 (until 2024) LZ0 (2023-present)
Layout
Configuration	Inline 6
Displacement	2,993 cubic centimetres (182.6 in3)
Cylinder bore	84 millimetres (3.3 in)
Piston stroke	90 millimetres (3.5 in)
Cylinder block material	Cast aluminum
Cylinder head material	Cast aluminum
Valvetrain	DOHC
Valvetrain drive system	Chains
Compression ratio	15.0: 1
Combustion
Operating principle	Diesel
Fuel system	Common rail direct fuel injection
Management	GM D1P-E98
Fuel type	ultra-low-sulfur diesel B20 biodiesel EN 590 diesel
Output
Power output	277–305 horsepower (207–227 kW)
Specific power	92.3-101.7 hp/L
Torque output	460–495 pound-feet (624–671 N⋅m)
Dimensions
Length	908 millimetres (35.7 in)
Width	914 millimetres (36.0 in)
Height	903 millimetres (35.6 in)
Dry weight	212 kilograms (467 lb)
Emissions
Emissions target standard	Tier 3 Bin 160

Engine details

• Displacement: 3.0L
• Configuration: Inline 6
• Horsepower: 277-305 hp @ 3750 rpm
• Torque: 460-495 ft-lb (624-671 nm) @ 1500 rpm
• RPO code: LM2 (until 2024), LZ0 (2023-present)
• Intercooler: liquid-to-air
• Block: Aluminum
• Head: Aluminum
• Crankshaft: Forged Steel
• Rods: Forged
• Pistons: Hypereutetic cast aluminum alloy - LZ0 upgraded to steel pistons
• Cylinder liners: Iron

The engine's timing components are located at the rear of the engine, and feature timing chains to drive the camshafts and high pressure fuel pump, and a wet belt to drive the oil pump. This arrangement makes inspection and replacement very difficult and expensive. ^[1]

Most of the development and engineering work for the LM2 Duramax, as well as primary calibration took place in Turin, Italy.^[2][3] The engine is being produced at Flint Engine Operations.^[4] A test by Car and Driver showed 40 MPG is possible when hypermiling.^[5]