GM Duramax engines are a series of turbo-diesel engines produced by General Motors for use in pickup trucks, SUVs and vans.
First introduced in 2001, Duramax engines range from four, six and eight cylinders in either inline (I) or V configurations.
Produced Duramax Engines
Duramax engines have been produced globally since 2001, and include:
- 6.6L V-8 LB7
- 6.6L V-8 LLY
- 6.6L V-8 LBZ
- 6.6L V-8 LMM
- 6.6L V-8 LGH
- 6.6L V-8 LML
- 6.6L V-8 L5P
- 2.8L I-4 XLD28
- 2.5L I-4 XLD25
- 2.8L I-4 LWN
- 3.0L I-6 LM2
- 3.0L I-6 LZ0
GM Duramax Turbo Diesel Engines
| Engine RPO Code | Production (model years) | Displacement (L / ci) | Layout & Cylinders | Valvetrain | Aspiration | Compression Ratio | Bore & Stroke (in / mm) | Fuel | Fuel Delivery | Engine Block Material | Cylinder Head Material | Power (hp / kW @ RPM) | Torque (lb-ft / Nm @ RPM) | Chevrolet Applications | GMC Applications | Other Applications |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LB7 | 2001 - 2004 | 6.6 / 402.7 | V-8 | OHV, 4 valves per cylinder | Turbocharged & Intercooled | 17.5:1 | 4.06 x 3.90 / 103 x 99 | Diesel | Direct injection, high pressure common-rail | Cast Iron | Aluminum | 300 / 223.7 @ 3100 | 520 / 705 @ 1800 | Kodiak, Silverado HD | Topkick, Sierra HD | |
| LLY | 2004 - 2005 | 6.6 / 402.7 | V-8 | OHV, 4 valves per cylinder | Turbocharged & Intercooled | 17.5:1 | 4.06 x 3.90 / 103 x 99 | Diesel | Direct injection, high pressure common-rail | Cast gray iron | Cast aluminum | 305 / 227 @ 3000 | 605 / 820 @ 1600 | Silverado HD | Sierra HD | Hummer H1 Alpha |
| LLY/LBZ | 2006 - 2007 | 6.6 / 402.7 | V-8 | OHV, 4 valves per cylinder | Turbocharged & Intercooled | 16.8:1 | 4.06 x 3.90 / 103 x 99 | Diesel | Direct injection, high pressure common-rail | Cast gray iron | Cast aluminum | 250 - 360 / 190 - 270 @3200 | 460 - 650 / 624 - 881 @1600 | Kodiak, Silverado HD, Express | Topkick, Sierra, Savanna | |
| LMM | 2007 - 2010 | 6.6 / 402.7 | V-8 | OHV, 4 valves per cylinder | Turbocharged & Intercooled | 16.8:1 | 4.06 x 3.90 / 103 x 99 | Diesel | Direct injection, high pressure common-rail | Cast gray iron | Cast aluminum | 250 - 365 / 190 - 272 @3200 | 460 - 660 / 624 - 895 @1600 | Kodiak, Silverado HD, Express | Topkick, Sierra HD, Savanna | |
| LGH | 2010 - 2017 | 6.6 / 402.7 | V-8 | OHV, 4 valves per cylinder | Turbocharged & Intercooled | 16.0:1 | 4.06 x 3.90 / 103 x 99 | Diesel | Direct injection, high pressure common-rail | Cast iron | Cast aluminum | 260 - 335 / 194 - 250 @ 3100 | 525 - 685 / 712 - 929 @ 1600 | Silverado HD, Express | Sierra HD, Savanna | |
| LML | 2011 - 2016 | 6.6 / 402.7 | V-8 | OHV, 4 valves per cylinder | Turbocharged & Intercooled | 16.0:1 | 4.06 x 3.90 / 103 x 99 | Diesel | Direct injection, high pressure common-rail | Cast iron | Cast aluminum | 397 / 294 @ 3000 | 765 / 1037 @ 1600 | Silverado HD | Sierra HD | |
| XLD25 | 2011 - Present | 2.5 / 152.5 | I-4 | DOHC, 4 valves per cylinder | Turbocharged | 16.5:1 | 3.62 x 3.7 / 92 x 94 | Diesel | Direct injection, high pressure common-rail | Cast iron | Cast aluminum | 163 / 120 @ 3600 | 280 / 38- @ 2000 | Colorado/S-10, TrailBlazer (International Markets) | ||
| XLD28 | 2012 - Present | 2.8 / 170.8 | I-4 | DOHC, 4 valves per cylinder | Turbocharged | 16.5:1 | 3.7 x 3.9 / 94 x 100 | Diesel | Direct injection, high pressure common-rail | Cast iron | Cast aluminum | 200 / 147 @ 3600 | 360 / 500 @ 2000 | Colorado/S-10, TrailBlazer (International Markets) | ||
| LWN | 2014 - Present | 2.8 / 170.8 | I-4 | DOHC, 4 valves per cylinder | Turbocharged | 16.5:1 | 3.7 x 3.9 / 94 x 100 | Diesel | Direct injection, high pressure common-rail | Cast grey iron | Cast aluminum | 181 / 135 @ 3400 | 369 / 500 / @ 2000 | Colorado | Canyon | |
| L5P | 2017 - Present | 6.6 / 402.7 | V-8 | OHV, 4 valves per cylinder | Turbocharged & Intercooled | 16.0:1 | 4.06 x 3.90 / 103 x 99 | Diesel | Direct injection, high pressure common-rail | Cast iron | Cast aluminum | 445 / 331.8 @ 2800 | 910 / 1233.8 @ 1600 | Silverado HD | Sierra HD | |
| LM2 | 2019 - Present | 3.0 / 183 | I-6 | DOHC, 4 valves per cylinder | Turbocharged | TBA | 3.30 x 3.54 / 84 x 90 | Diesel | Direct injection, high pressure common-rail | Cast aluminum | Cast aluminum | 277 / 207 @ 3750 | 460 / 623 @ 1500 | Silverado 1500, Tahoe, Suburban | Sierra 1500, Yukon, Yukon XL | Cadillac Escalade, Cadillac Escalade ESV |
| LZ0 | 2023 - Present | 3.0 / 183 | I-6 | DOHC, 4 valves per cylinder | Turbocharged | TBA | 3.30 x 3.54 / 84 x 90 | Diesel | Direct injection, high pressure common-rail | Cast aluminum | Cast aluminum | 305 / TBA @ TBA | 495 / TBA @ TBA | Silverado 1500, Tahoe, Suburban | Sierra 1500, Yukon, Yukon XL | Cadillac Escalade, Cadillac Escalade ESV |
| LMK | Never produced | 4.5 / 274.6 | V-8 | OHV, 4 valves per cylinder | Turbocharged | Unknown | Unknown | Diesel | Direct injection, high pressure common-rail | Unknown | Unknown | 310 / 231 @ TBD | 520 / 705 @ TBD | Not produced, originally planned for Silverado 1500 | Not produced, originally planned for Sierra 1500 |
Non-Production Duramax Engines
From what we know, one Duramax engine was developed but was never put into production.
Developed entirely in-house by GM and assigned RPO Code LMK, the engine displaced 4.5 liters from a V8 layout. It was report to have been rated at 310 horsepower and 520 pound-feet of torque while meeting all modern emissions requirements. The motor, sometimes referred to as Baby Duramax, was slated to be offered in GM’s light duty pickup trucks – the Chevrolet Silverado 1500 and GMC Sierra 1500 – for the 2010 model year.
However, after fully completing development of the engine, GM decided not to produce it due to reasons associated with the “economic climate”. After that, the automaker considered several times to put the 4.5L Duramax into production, but never did. Instead, it developed two new small-displacement Duramax engines – the 2.8L I4 LWN (XLD28 in international markets) and the 3.0L I6 LM2.
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