The 2023 Chevy Silverado 1500 and 2023 GMC Sierra 1500 introduce a handful of updates and changes over the nameplates’ preceding, fully refreshed 2022 model year, including the new 3.0L I6 LZ0 turbodiesel Duramax engine. Arriving as a replacement for the 3.0L I6 LM2 turbodiesel Duramax engine offered previously, the new LZ0 engine is similar to the LM2, but different in a few key areas. Now, GM Authority is comparing the two diesel engine to see how they stack up.
In terms of specs, the big changes are the peak power and torque figures, with the new 3.0L I6 LZ0 turbodiesel Duramax engine producing a maximum of 305 horsepower at 3,750 rpm and 495 pound-feet of torque at 2,750, as compared to a maximum of 277 horsepower at 3,750 rpm and 460 pound-feet of torque at 1,500 rpm produced by the turbocharged 3.0L I6 LM2 turbodiesel Duramax engine.
Meanwhile, fuel economy, payload, and towing are virtually unchanged for diesel-powered 2023 Chevy Silverado 1500 and 2023 GMC Sierra 1500 models. Check out the table below for more information on specs between these two diesel engines and how they compare to rival products from Ford, Ram, and Toyota:
|GM Duramax LM2||GM Duramax LM2||GM Duramax LZ0||Ford Power Stroke||Ram EcoDiesel||Ford PowerBoost||Toyota i-Force Max||Ram Pentastar||Ram Hemi|
|Vehicles||2021 Silverado 1500||2022 Silverado 1500||2023 Silverado 1500||2021 Ford F-150||2022 Ram 1500||2022 Ford F-150||2022 Toyota Tundra||2022 Ram 1500||2022 Ram 1500|
|Engine Type||I6||I6||I6||V6||V6||Hybrid V6||Hybrid V6||eTorque mild hybrid V6||rTorque mild hybrid V8|
|Aspiration||Turbocharged||Turbocharged||Turbocharged||Turbocharged||Turbocharged||Twin-turbocharged||Twin-turbocharged||Naturally Aspirated||Naturally Aspirated|
|Fuel Type||Diesel||Diesel||Diesel||Diesel||Diesel||Regular gasoline||Regular gasoline||Regular gasoline||Midgrade|
|Horsepower (hp @ rpm)||277 @ 3,750||277 @ 3,750||305 @ 3,750||250 @ 3,250||260 @ 3,600||430 @ 6,000||437 @ 5,200||305 @ 6,400||395 @ 5,600|
|Torque (lb-ft @ rpm)||460 @ 1,500||460 @ 1,500||495 @ 2,750||440 @ 1,750||480 @ 1,600||570 @ 3,000||583 @ 2,400||269 @ 4,800||410 @ 3,950|
|City Fuel Economy 2WD/4WD (mpg)||23/22||23/22||24/22||-/20||23/21||25/23||20/19||20/19||18/18|
|Highway Fuel Economy 2WD/4WD (mpg)||31/26||31/26||29/27||-/27||33/29||25/23||24/22||25/24||23/22|
|Combined Fuel Economy 2WD/4WD (mpg)||26/24||26/24||26/24||-/23||26/24||25/23||22/20||22/21||20/19|
|Max Payload Capacity (pounds)||1,870||1,930||1,920||1,840||2,090||2,120||1,665||2,300||1,800|
|Max Towing Capacity (pounds)||9,500||13,300||13,300||12,100||10,010||12,700||11,450||6,640||12,750|
In terms of mechanical differences, the LZ0 features a revised combustion bowl, and upgraded steel pistons, while the turbocharger was retuned and the fuel injectors were updated as well. The cooling system was also improved, while the oil belt life has been extended to 200,000 miles.
Critically, GM offers the 3.0L I6 LM2 turbodiesel Duramax under the hood of its full-size SUVs, including the 2023 Chevy Tahoe, 2023 Chevy Suburban, 2023 GMC Yukon, and 2023 Cadillac Escalade. According to GM Authority sources, these four models will not offer the new 3.0L I6 LZ0 turbodiesel Duramax engine. That said, the LZ0 is expected to be available with GM’s full-sizers for the 2024 model year.