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Click on the image for high-res shots of this diesel 1967 Mercury Cougar

Mark your calendars, because we're calling today a watershed moment for the advancement of diesel's acceptance in the U.S. General Motors has just announced a new 4.5L V8 Duramax turbo-diesel powerplant it plans to use in the Chevy Silverado and GMC Sierra half-ton pickups, as well as the HUMMER H2. The new oil burner is expected to produce at least 310 horsepower and 520 ft-lbs. of torque. It features dual-overhead cams, four valves per cylinder, a variable-vane turbocharger and aluminum cylind

Click on the image for two high-res images of GM's new 2.9-liter V6 turbo-diesel engine.

General Motors made two big announcements today about the state of its current diesel engine offerings. The company was forced to make a move in the face of upcoming stricter emissions standards that require a 90-percent reduction in particulate matter compared with the current standard, which was introduced in 2004, and a 50-percent reduction in NOx. The first big news is that the Duramax 6.6-liter turbo-diesel V8 used in various heavy-duty applications has been revised to meet the new standard

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