The LM2 is Chevrolet’s earlier 3.0L Duramax, a turbo-diesel inline-six found in the 2020 to 2022 Silverado 1500 and the 2021 to 2024 Tahoe and Suburban. If you’re shopping for a pre-owned diesel Chevy here in Northeast Florida, or you already drive one, it helps to know whether this is the engine you’re dealing with. The 2023 Silverado 1500 uses a different 3.0L Duramax, so the name alone won’t settle the question. All the figures below are for the LM2.
Here are the LM2’s core numbers, with output figures from the 2022 model year. LM2 is this engine’s RPO, or engine code.
| Detail | LM2 |
|---|---|
| RPO | LM2 |
| Displacement and layout | 3.0L turbo-diesel inline-six |
| Fuel type | Diesel |
| Fuel requirement (2021) | Ultra-low-sulfur diesel, 15 parts per million sulfur maximum |
| Output, Silverado 1500 (2022) | 277 hp; 460 lb-ft |
| Output, Tahoe (2022) | 277 hp at 3,750 rpm; 460 lb-ft at 1,500 rpm |
| Transmission | 10-speed automatic |
| Chevrolet applications | Silverado 1500, Tahoe, Suburban |
Chevrolet put the LM2 in the Silverado 1500, the Tahoe and the Suburban during the model years below.
2020, 2021, 2022
2021, 2022, 2023, 2024
2021, 2022, 2023, 2024
Those are the years the LM2 was offered, but that doesn’t mean every vehicle from those years has one.
For 2023, Chevrolet moved its Silverado 1500 to the second-generation 3.0L Duramax, engine code LZ0, and the 2024 model has it too. The LZ0 has its own specifications, so don’t carry the LM2’s numbers over to it.
Both engines carry the 3.0L Duramax name, so the model year is your first clue to which one you’re looking at. Ask us about the engine in a specific pre-owned Chevrolet.
For the 2021 LM2, Chevrolet calls for ultra-low-sulfur diesel, so the engine takes diesel fuel, never gasoline.
The oil Chevrolet specifies for the 2021 LM2 is dexosD-approved SAE 0W-20. The dexosD approval is part of the spec, so matching the viscosity alone isn’t enough.
For any model year other than 2021, follow the maintenance guidance for that specific vehicle, or talk with our service team about diesel maintenance.
When you’re hunting for an LM2-equipped Silverado 1500, Tahoe or Suburban, browse our pre-owned trucks and SUVs and check each listing’s year.
If you plan to tow a boat to the St. Johns River, look up the trailering specification for the exact truck or SUV you’re considering before you hitch up. Ask our service team about maintenance for your specific vehicle.
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The Silverado 1500 had it for 2020, 2021 and 2022, and the Tahoe and the Suburban had it for 2021 through 2024. Those years tell you where to look, not that every vehicle from them has the LM2.
LM2 is the RPO, or engine code, for Chevrolet’s earlier 3.0L Duramax turbo-diesel inline-six.
The LM2 makes 277 hp and 460 lb-ft in both the 2022 Silverado 1500 and the 2022 Tahoe. On that Tahoe, horsepower peaks at 3,750 rpm and torque at 1,500 rpm.
The LM2 is paired with a 10-speed automatic.
No. That truck uses the second-generation 3.0L Duramax, engine code LZ0. It has its own specifications, so the LM2’s figures don’t apply to it.
On a 2021 LM2, Chevrolet calls for ultra-low-sulfur diesel with sulfur no higher than 15 ppm. For another model year, follow that vehicle’s own maintenance guidance.
It’s dexosD-approved SAE 0W-20 engine oil.
Start with the model year. The LM2 was used in Silverado 1500 model years 2020 to 2022 and in Tahoe and Suburban model years 2021 to 2024, though a vehicle from those years won’t always have one. Ask us about the engine in a specific pre-owned Chevrolet.