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 | |
| Aka: | LM2(until 2024) LZ0(2023-present) |
| Configuration: | Inline 6 |
| Displacement: | 2993cc |
| Block: | Cast aluminum |
| Head: | Cast aluminum |
| Valvetrain: | DOHC |
| Timing: | Chains |
| Compression: | 15.0: 1 |
| Operating Principle: | Diesel |
| Fuelsystem: | Common rail direct fuel injection |
| Management: | GM D1P-E98 |
| Power: | NaNhp |
| Specpower: | 92.3-101.7 hp/L |
| Torque: | NaNlbft |
| Emissions Level: | Tier 3 Bin 160 |
277-305 hp @ 3750 rpm
460-495 ft-lb (624-671 nm) @ 1500 rpm
Forged Steel
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.[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]