Recent spy footage of several prototype GM HD trucks undergoing testing in Colorado has reignited speculation about the long-rumored 8.3L Duramax diesel engine, nicknamed "MegaMax." The video was ...

The L5P Duramax diesel V8 is what powers heavy-duty work trucks like the 2025 Chevy Silverado 2500 HD and is an amazing powerhouse. It didn't exactly start off that way back in 1984 when GM first ...

The Duramax V8 L5P has a displacement of 6.6 liters, which is slightly smaller than the 6.7L engines offered by Ford and Ram. Despite this, the L5P delivers 470 horsepower at 2,800 rpm, making it ...

Discover the surprising Japanese roots of GM's popular Duramax diesel engine, a powerhouse for US pickup trucks since 2001.

Introduced in 2001, the Duramax V8 turbo diesel family was continuously improved over the years until the L5P that GM uses in heavy-duty trucks. Fully stock, the 6.6-liter mill develops 445 horsepower ...

In the May 2017 issue ofDiesel Power, in an article titled “Inside the Duramax L5P,” we visited Gale Banks Engineering in Azusa, California, and documented the complete dismantling of a ...

Whenever you change your vehicle’s oil, some of the old stuff always gets left behind. Your average lube tech isn’t flushing out all the oil galleys before unscrewing the drain plug, and really, there ...