{{see also|Duramax (disambiguation){{!}}Duramax}} {{Use American English|date=May 2026}} {{Use mdy dates|date=May 2026}} {{Infobox engine | name = Duramax I-6 | image = | manufacturer = [[General Motors]] | aka = LM2 (until 2024)<br />LZ0 (2023-present) | production = | predecessor = | successor = | configuration = [[Straight-six engine|Inline 6]] | displacement = {{convert|2993|cc|in3}} | bore = {{convert|84|mm}} | stroke = {{convert|90|mm}} | block = Cast aluminum | head = Cast aluminum | valvetrain = DOHC | timing = Chains | compression = 15.2: 1 | supercharger = | turbocharger = One | turboboostpressure = | operating principle = Diesel | fuelsystem = Common rail direct fuel injection | management = GM D1P-E98 | fueltype = {{ubl|ultra-low-sulfur diesel|B20 biodiesel|EN 590 diesel}} | oilsystem = | coolingsystem = | idle = | redline = | power = {{convert|277-305 |hp |kW}} | specpower = 92.3-101.7 hp/L | torque = {{convert|460-495 |lbft |Nm}} | length = {{convert|908 |mm}} | width = {{convert|914 |mm}} | height = {{convert|903 |mm}} | diameter = | weight = {{convert|212 |kg}} | emissions level = Tier 3 Bin 160 | emissions control = }}
The '''Duramax I6 engine''' is a [[diesel engine]] available in select models of [[General Motors]] [[light truck|light-duty]] [[Pickup truck|trucks]] and [[Sport utility vehicle|SUVs]]. Applications include the [[Chevrolet Silverado|Chevrolet Silverado/GMC Sierra 1500]], [[Chevrolet Suburban|Chevrolet Suburban/GMC Yukon XL]], [[Chevrolet Tahoe|Chevrolet Tahoe/GMC Yukon]], and [[Cadillac Escalade]] (both short wheelbase and ESV). The engine was developed together with [[Opel]], who are manufacturing three- and four-cylinder versions displacing 1.5 and 2.0 liters, using the same engine architecture.
==Engine details== *Displacement: 3.0L *Configuration: [[Straight-six engine|Inline 6]] *[[Horsepower]]: 277-305 hp @ 3750 rpm *[[Torque]]: 460-495 ft-lb (624-671 nm) @ 1500 rpm *RPO code: LM2 (until 2024), LZ0 (2023-present) *Intercooler: liquid-to-air *Block: Aluminum *Head: Aluminum *[[Crankshaft]]: Forged Steel *Rods: Forged *Pistons: [[Hypereutectic piston|Hypereutetic]] cast aluminum alloy - LZ0 upgraded to steel pistons *Cylinder liners: Iron
The engine's timing components are located at the rear of the engine, and feature timing chains to drive the camshafts and high pressure fuel pump, and a wet belt to drive the oil pump. This arrangement makes inspection and replacement very difficult and expensive.<ref>Archived at [https://ghostarchive.org/varchive/youtube/20211209/NFNsg7bCtdA Ghostarchive]{{cbignore}} and the [https://web.archive.org/web/20200719184044/https://www.youtube.com/watch?v=NFNsg7bCtdA Wayback Machine]{{cbignore}}: {{cite AV media| url = https://www.youtube.com/watch?v=NFNsg7bCtdA| title = What you don't know about the 3.0-liter Duramax diesel | website=[[YouTube]]}}{{cbignore}}</ref>
Most of the development and engineering work for the LM2 Duramax, as well as primary calibration took place in [[Turin]], Italy.<ref>{{Cite web|url=https://www.gm-trucks.com/forums/topic/225182-just-do-it-2020-silverado-1500-30l-duramax-diesel/|title=Just do It! - 2020 Silverado 1500 3.0L Duramax Diesel |date=24 June 2019 }}</ref><ref>{{cite web |last1=Gibbs |first1=Nick |title=GM's hopes for a diesel revival start in Turin |url=https://europe.autonews.com/article/20180623/COPY/306239996/gm-s-hopes-for-a-diesel-revival-start-in-turin |website=Automotive News Europe |accessdate=27 December 2019 |language=en |date=23 June 2018}}</ref> The engine is being produced at [[Flint Engine Operations]].<ref>{{Cite web|url=https://media.gm.com/media/us/en/gm/company_info/facilities/powertrain/flint.html|title=GM Corporate Newsroom - United States - Company}}</ref> A test by [[Car and Driver]] showed 40 MPG is possible when [[hypermiling]].<ref>{{Cite web|url=https://www.caranddriver.com/reviews/a28148602/2020-chevrolet-silverado-3-0l-diesel-drive/|title=2020 Chevy Silverado 1500 3.0L Duramax is Smoother Than it is Capable|date=10 December 2019}}</ref>
==References== {{reflist}} {{GM late engine timeline}} {{DEFAULTSORT:Duramax 6}} [[Category:General Motors engines]] [[Category:Diesel engines by model]] [[Category:Straight-six engines]] [[Category:2020s automobile engines]]