3.0L Duramax LM2/LZ0 Specs: Towing, MPG, Reliability (2019-2026)

GM’s 3.0L Duramax I6 comes in two distinct generations, and the specs shift meaningfully between them. The LM2, built from 2019 through 2022, and the LZ0, built from 2023 onward, share a displacement but not a power rating.

The engine powers the Chevrolet Silverado 1500, GMC Sierra 1500, and later a full lineup of GM’s full-size SUVs. This chart separates every generation by exact model year, vehicle, and spec, so you know precisely what sits under the hood of the truck you own or the one you’re shopping for.

This matters more than it does with most engine updates. A used LM2-equipped Silverado and a current LZ0-equipped Silverado carry the same “3.0 Duramax” name on the window sticker, but they don’t tow, tune, or perform the same. Knowing which generation you’re looking at changes how you shop, how you tow, and what upgrades are worth pursuing.

3.0 Duramax LM2 Specs 2019 to 2022

The first-generation LM2 produces 277 horsepower at 3,750 rpm and 460 lb-ft of torque at 1,500 rpm. Every LM2-equipped truck pairs with GM’s 10L80 10-speed automatic transmission, the only transmission ever offered with this engine.

GM introduced the LM2 in the 2019 Silverado 1500 and Sierra 1500, with 2020 marking the first full model year of production. The engine expanded into GM’s full-size SUV lineup for 2021, appearing in the Chevrolet Tahoe, Chevrolet Suburban, GMC Yukon, and Cadillac Escalade.

A cast aluminum block with pressed-in iron cylinder liners keeps the LM2 light without sacrificing wear resistance. Some early internal GM documentation cited slightly different figures, around 282 horsepower and 450 lb-ft, but 277 horsepower and 460 lb-ft are the figures GM officially advertised and the ones that appear on the window sticker.

The LM2 stayed in production through the 2022 model year in pickups before GM replaced it with a more powerful successor.

Early LM2 trucks, particularly 2019 and 2020 model years, drew owner reports of intermittent crank no-start conditions and turbo actuator faults, according to owner forum discussion on diesel-focused GM boards. GM addressed most of these issues through revised software calibrations and component updates on later production runs, and the fundamental architecture proved durable once the early bugs were resolved.

3.0 Duramax LZ0 Specs 2023 and Newer

The LZ0 replaced the LM2 for the 2023 model year and delivers a real jump in output. GM’s own engineering data puts peak power at 305 horsepower at 3,750 rpm and peak torque at 495 lb-ft at 2,750 rpm, a 10 percent horsepower gain and a 7.6 percent torque gain over the LM2.

GM revised roughly 25 percent of the engine’s internal components to reach those numbers, including updates to the turbocharger, fuel injection system, and engine calibration. The displacement holds steady at 3.0 liters, and the LZ0 still pairs exclusively with the 10L80 10-speed automatic.

The LZ0 launched in the 2023 Silverado 1500 and Sierra 1500. GM later brought it to the full-size SUV lineup for the 2025 model year, appearing in the Tahoe, Suburban, Yukon, Yukon XL, Escalade, and Escalade ESV.

Between the two generations, the LZ0 is the clear performance leader, and it’s the version currently in production on every new Duramax-equipped Silverado and Sierra. Both engines use a Diesel Exhaust Fluid, or DEF, injection system as part of their selective catalytic reduction emissions setup, and both require refilling the DEF tank roughly every 5,000 to 7,000 miles depending on driving conditions.

3.0 Duramax Towing and Payload by Generation

Towing capacity is where the generational gap matters most to buyers. LM2-equipped Silverado 1500 and Sierra 1500 trucks topped out around 9,300 pounds of maximum towing when properly equipped.

The LZ0 update changed that picture substantially. A 2026 Silverado 1500 Duramax Double Cab Standard Bed 2WD, equipped with the Max Trailering Package and 20-inch wheels, is rated to tow up to 13,300 pounds, according to Chevrolet’s official trailering guide.

Maximum available payload on the current Silverado 1500 lineup reaches up to 2,260 pounds, though the exact figure depends on trim and engine choice since payload is limited by curb weight rather than engine output.

These are the top-line, best-case numbers. Exact towing and payload ratings shift based on cab style, bed length, drivetrain, axle ratio, and whether the Max Trailering Package is fitted. Always confirm the specific rating for your configuration using the door-jamb Tire and Loading Information label or Chevrolet’s official trailering calculator before hitching up a heavy load.

Interestingly, the 13,300-pound ceiling on the LZ0-equipped Duramax isn’t unique among Silverado engine choices. The gas 6.2L V8 matches that same 13,300-pound rating with the Max Trailering Package fitted, meaning the Duramax’s real advantage over the top gas engine isn’t outright towing capacity.

It’s the low-rpm torque delivery and the fuel economy gained while working at that towing capacity over long distances, since diesel torque peaks far earlier in the rev range than a comparable gas V8’s does.

3.0 Duramax Vehicle Applications by Year

Knowing which generation is under the hood requires knowing the exact vehicle and model year, not just the “3.0 Duramax” badge.

The Silverado 1500 and Sierra 1500 always led each generational rollout by two full model years before the SUV lineup caught up. If you’re shopping a used Silverado 1500 and want to know how a specific model year holds up beyond the engine spec sheet, our Chevrolet Silverado 1500 years to avoid guide breaks down generation-specific reliability concerns.

This engine remains the only diesel currently offered in a domestic half-ton pickup, now that Ram and Ford have both exited that segment.

3.0 Duramax Fuel Economy LM2 vs LZ0

Fuel economy is the other half of the Duramax’s sales pitch, and it holds up across both generations. EPA-estimated figures for a 2WD LM2-equipped Silverado 1500 land around 23 mpg city and 29 mpg highway.

The current 2WD LZ0-equipped 2026 Silverado 1500 carries an EPA-estimated rating of 23 mpg city and 28 mpg highway, for a 25 mpg combined figure. Real-world highway reports from some owners run higher, occasionally into the low 30s under light-load highway driving,

though EPA window-sticker numbers remain the standard for comparison shopping. Four-wheel-drive models return slightly lower figures across both generations due to added drivetrain weight and friction.

That efficiency, combined with a 33-gallon-plus fuel tank on most configurations, gives Duramax-equipped trucks a highway range that regularly clears 600 miles between fill-ups.

3.0 Duramax Engine Design Bore Stroke and Turbo

Both generations share the same fundamental architecture. The block is cast aluminum with pressed-in iron cylinder liners, keeping weight down while protecting critical wear surfaces from a diesel’s higher cylinder pressures.

Bore measures 3.3 inches and stroke measures 3.54 inches, giving the engine an undersquare configuration that favors low-rpm torque delivery over high-rpm revving, exactly what a towing-focused engine needs. A single variable-geometry turbocharger and common-rail fuel injection system handle boost and fuel delivery.

An Active Thermal Management system sets this engine apart from a simple mechanical thermostat. Electronically controlled rotary valves route coolant based on real-time sensor data, restricting flow to the block during warm-up and increasing it under heavy load to manage heat.

Compression ratio moved from 15.0:1 on the LM2 to 15.2:1 on the LZ0, a change made possible by switching from an aluminum piston design to steel pistons with a revised bowl geometry, which better tolerate the higher cylinder pressures needed for the power increase.

The turbocharger itself uses ball-bearing construction rather than a traditional journal-bearing design, which reduces internal friction and helps the turbo spool faster at low rpm. That faster spool is a meaningful piece of why this small-displacement diesel can move a loaded half-ton truck’s Gross Combined Weight Rating,

or GCWR, the total allowable weight of the truck, trailer, and cargo combined, without feeling strained at highway speed. GCWR varies by cab, bed, and drivetrain configuration, so confirm the exact figure for your specific build on the door-jamb Tire and Loading Information label before towing near the truck’s limit.

If you’re servicing or working around this platform, our Chevy Silverado 1500 lug nut torque specs guide covers the wheel and service torque values you’ll need on the same generation trucks.

3.0 Duramax vs Ram EcoDiesel vs Ford Power Stroke

The 3.0 Duramax now stands alone. Ram ended production of its 3.0L EcoDiesel V6 in January 2023, and the final version made 260 horsepower and 480 lb-ft of torque with a 12,560-pound max tow rating. Ford discontinued its 3.0L Power Stroke V6 after the 2021 model year, with that engine rated at 250 horsepower and 440 lb-ft of torque.

Both Stellantis and Ford shifted their light-duty diesel investment toward electrification and gas turbo options instead of continuing to develop their half-ton diesels. GM took the opposite bet, and the LZ0 update is the result.

For Silverado and Sierra owners looking to get more out of the platform, our best performance chips for the GMC Sierra 1500 guide is a reasonable starting point once you understand the baseline specs above.

3.0 Duramax Specs FAQ

What is the horsepower of the 3.0 Duramax?

The first-generation LM2, built 2019 to 2022, produces 277 horsepower. The updated LZ0, built 2023 to present, produces 305 horsepower. Both figures are peak output at 3,750 rpm.

What is the difference between the LM2 and LZ0 Duramax?

The LZ0 replaced the LM2 for the 2023 model year with a 28 horsepower and 35 lb-ft torque increase, along with updates to roughly 25 percent of the engine’s internal components, including the turbocharger and fuel injection system.

How much can a 3.0 Duramax tow?

LM2-equipped trucks topped out around 9,300 pounds. LZ0-equipped 2026 Silverado 1500 and Sierra 1500 models can tow up to 13,300 pounds when properly equipped with the Max Trailering Package, according to Chevrolet’s official trailering guide.

Is the 3.0 Duramax reliable?

Both generations are generally considered dependable diesel engines, though early LM2 models, especially 2019 and 2020 trucks, experienced some reported issues with crank no-start conditions and turbo actuators. The LZ0 update addressed most commonly reported early LM2 concerns through revised components and calibration.

What trucks and SUVs have the 3.0 Duramax engine?

The Silverado 1500 and Sierra 1500 have offered it since 2019. The Tahoe, Suburban, Yukon, Yukon XL, and Escalade added the LM2 for 2021 and moved to the LZ0 starting in 2025.

The Bottom Line on 3.0 Duramax Specs

Generation is the detail that changes everything about this engine’s numbers. A used 2020 Silverado 1500 Duramax and a new 2026 model share a badge but not a spec sheet, and the gap between 277 horsepower with 9,300 pounds of towing and 305 horsepower with 13,300 pounds of towing is significant enough to change which truck fits your work.

Buyers shopping used should confirm LM2 versus LZ0 by model year before comparing listings. Buyers shopping new are getting the LZ0 by default, and it remains the only diesel engine available in a half-ton pickup on the market today. Once you’ve confirmed which generation fits your needs, our GMC Sierra 1500 accessories guide is a solid next stop for outfitting the truck.