The Duramax I4 engine is a family of

turbocharged In an internal combustion engine, a turbocharger (also known as a turbo or a turbosupercharger) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake air, forcing more air into the ...

diesel Diesel may refer to: * Diesel engine, an internal combustion engine where ignition is caused by compression * Diesel fuel, a liquid fuel used in diesel engines * Diesel locomotive, a railway locomotive in which the prime mover is a diesel engine ...

I4 engine A straight-four engine (also referred to as an inline-four engine) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. The majority of automotive four-cylinder engines use a straight-four layout ( ...

s sold by

General Motors General Motors Company (GM) is an American Multinational corporation, multinational Automotive industry, automotive manufacturing company headquartered in Detroit, Michigan, United States. The company is most known for owning and manufacturing f ...

in 2.5 and 2.8 liter sizes as an option for the

Chevrolet Colorado The Chevrolet Colorado (sharing mechanical commonality with the GMC Canyon) is a series of compact pickup trucks (mid-size since second generation) marketed by American automaker General Motors. They were introduced in 2004 to replace the Chevrol ...

GMC Canyon GMC may refer to: Government India * Gandhinagar Municipal Corporation, in Gujarat * Gobichettipalayam Municipal Corporation, in Tamil Nadu * Guntur Municipal Corporation, in Andhra Pradesh * Guwahati Municipal Corporation, in Assam * Gwalior ...

Chevrolet Express The Chevrolet Express (also known as the GMC Savana) is a series of full-size vans produced by General Motors since 1996. The successor to the Chevrolet G-series van, the Express is produced in passenger and cargo variants. Alongside the stan ...

, and

GMC Savana Savana is a town and commune in Madagascar. It belongs to the district of Vohipeno, which is a part of Vatovavy-Fitovinany Region. The population of the commune was estimated to be approximately 4,000 in the 2001 commune census. Only primary s ...

in southeast Asia and Oceania (Australia / New Zealand) from 2012, and in North America from 2016 through 2022. They are closely related to the

VM Motori VM Motori S.p.A. is an Italian diesel engine manufacturing company which is wholly owned by Stellantis. VM headquarters and main production facilities are located in Cento, in Emilia-Romagna, Italy. History VM Motori was founded by two entrep ...

''R 425'' and ''A 428'', and were produced at the General Motors Thailand plant in

Rayong Rayong (, ) is a city (''thesaban nakhon'') on the east coast of the Gulf of Thailand and the capital of Rayong province. It covers tambons Tha Pradu and Pak Nam and parts of ''tambons'' Choeng Noen and Noen Phra, all within Mueang Rayong dist ...

History

GM purchased a 50% stake in VM Motori from Penske Automotive in 2007. In 2010, VM released the ''A 428'' (four-cylinder, 2.8 L displacement), developed from the earlier ''R 428'', which was sold in North America briefly as an optional engine for the

Jeep Liberty The Jeep Liberty is a four door unibody compact SUV manufactured and marketed by Jeep for model years 2002–2012 over two generations, internally designated the KJ (2002–2007) and KK (2008–2012), respectively. Both generations were marketed ...

for the 2005 and 2006 model years.

Fiat Fiat Automobiles S.p.A., commonly known as simply Fiat ( , ; ), is an Italian automobile manufacturer. It became a part of Fiat Chrysler Automobiles in 2014 and, in 2021, became a subsidiary of Stellantis through its Italian division, Stellant ...

acquired the other half of VM from Penske in 2011 and purchased GM's share in 2013; as part of the sale, GM retained the rights to build engines that had been developed during its ownership, including the ''A 428''. In 2011, GM completed a new engine plant in Rayong, Thailand, commencing production in September of the ''R 425'' and ''A 428'' as Duramax ''XLD25'' and ''XLD28'', respectively, for the

and Trailblazer sold in southeast Asia and, under the

Holden Holden, formerly known as General Motors-Holden, was an Australian subsidiary company of General Motors. Founded in Adelaide, it was an automobile manufacturer, importer, and exporter that sold cars under its own marque in Australia. It was ...

marque, in Oceania. In 2013, these engines were updated as the Duramax ''LKH'' (2.5L) and ''LWH'' (2.8L), improving output and fuel consumption. The Rayong plant began producing the 2.8L Duramax I4 ''LWN'' starting in 2015, modified to meet emissions regulations in the United States.

Engine RPO codes

LWN

RPO ''LWN'' was first introduced in 2016 and continued until 2022, after GM Thailand was dissolved in 2020. It is a 16-valve design with high-pressure common-rail direct injection. The diesel engine was discontinued after the 2022 model year. The following trucks use the ''LWN'': * 2016–2022 Chevrolet Colorado / GMC Canyon (North America) * 2017–2022 Chevrolet Express / GMC Savana (North America)

XLD25 LP2

RPO XLD25 (LP2) was sold in Thailand, meeting

Euro 4 The European emission standards are vehicle emission standards that regulate pollution from the use of new land surface vehicles sold in the European Union and European Economic Area member states and the United Kingdom, and ships in European ...

emissions standards. It is a turbocharged 16V DOHC engine with common-rail direct injection. The bore and stroke are , respectively, with a rated output of at 3,600 rpm and at 2,000 rpm. * 2014–? Chevrolet Colorado * 2017–2020 Chevrolet Trailblazer

XLD25

As originally released, the Duramax ''XLD25'' had an output of at 3,800 RPM and at 2,000 RPM. * 2012–2013 Chevrolet Colorado

XLD28

As originally released, the Duramax ''XLD28'' had an output of at 3,800 RPM and at 2,000 RPM, depending on the transmission. * 2012–2013 Chevrolet Colorado

References

External links

* {{cite web , url=https://dieselresource.com/diesel-resources/2-8l-lwn-duramax-specs/ , title=2.8L LWN Duramax specs, tow ratings, and fuel economy , date=August 31, 2020 , work=Diesel Resource DMAX engines Diesel engines by model