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More Horsepower, More Torque, And More Refined

2022 Chevrolet Silverado High Country 1500
2022 Chevrolet Silverado High Country exterior

Remember when we reported in 2019 that General Motors was looking to improve its Duramax diesel engine for half-ton trucks? We sure do. And that time is finally here. Along with the 2023 Chevrolet Silverado 1500 ZR2 Bison announcement comes the first official details on the LZ0 3.0L inline-six turbodiesel engine. The LZ0 will be available on select – but not all – trims of the 2023 Chevrolet Silverado 1500 and 2023 GMC Sierra 1500. Chevrolet says this new diesel will be available on 2023 Silverado 1500 Custom Trail Boss, LT, RST, LT Trail Boss, LTZ, and High Country trims. The engine will continue to be exclusively paired with a 10-speed automatic transmission for retail customers.

For those seeking a Chevrolet Silverado ZR2 Duramax or a GMC Sierra AT4X Duramax, you’ll have to wait for the 2024 model year. You read it here first.

LM2 LZ0 Duramax Diesel GM T1 General Motors Trucks SUVs SUV Chevrolet Silverado GMC Sierra Cadillac Escalade Yukon Tahoe Suburban Denali XL
3.0L LM2 Duramax I6 Diesel Engine. Photo via GM.

2023 Silverado And Sierra 1500 LZ0 Duramax Engine: Details

The LZ0 Duramax engine replaces the current LM2 Duramax, and is primed to deliver a sizable increase in power and torque for diesel customers. New power numbers are substantially increased, to the tune of 305 horsepower and 495 lb-ft of torque, which is a 10% increase (277 hp in 22MY) and a 7.6% increase (460 lb-ft in 22MY). This has been accomplished with the help of several key component upgrades, including new steel pistons with a revised combustion bowl, a retuned turbo compressor, new fuel injectors, and improved temperature control features. These power bumps come after the major towing and payload improvements that were announced for the 2022 model year. LZ0 towing and payload numbers for the 2023 Chevrolet Silverado 1500 and 2023 GMC Sierra 1500 are not yet finalized. The same goes for fuel economy.

General Motors will continue assembling the Duramax engine at their Flint Engine Operations in Michigan. It will be available on select trims for the 2023 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks by the end of this year. Poised to offer customers smooth, quiet power that the Duramax engines are known for with enhanced power and capability, making the trucks even more useful for whatever purpose people may have for them.

2020 2021 2022 2023 Chevrolet Silverado 1500 engine engines LM2 Duamax Diesel
Image via GM

Written by Zac Quinn

Zac's love for cars started at a young age, after seeing the popular Eleanor from Gone In 60 Seconds. From there, fascination and enthusiasm blossomed and to this day the Ford Mustang remains a favorite. His first job started out detailing cars, but also provided the opportunity to work on restoration including an 1968 Ford Mustang, Pontiac Firebird, and a C3 Corvette, though he left that job before further work and experience could be had. From there, he was a detailer at a car dealership before quitting that job to try and finish college.

Much of his free time while studying was spent watching YouTube videos regarding new cars, or off-roading. 4WD247 is a personal favorite channel which rekindled a dying flame in car enthusiasm, now tailored towards trucks and SUVs and the fun that can be had building up an overlanding rig, and going on adventures, though, that chapter remains unwritten for the time being.


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    • Jon – we break exclusive GM truck news all the time, and this time is no different. We were also the first to report that GM would be using the 2.7L L3B in the Colorado and Canyon, as well as dropping the diesel engine. We were also first to write about the Silverado ZR2 and the ZR2 Bison. Our reporting speaks for itself.

  1. Very excited for this engine! Interested to see what MPG on the LZ0 will be, I know speculation says about the same as the LM2, but I’m hoping for a 1-2 MPG improvement with some of the upgrades being made.

  2. They started building late August the 2023, have you heard when we should start seeing them at the dealerships? I ordered a Ltz and the new LZO

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