As of January 1, 2007, all manufactured diesel pickups were built to include a new particulate filter system to reduce emissions and help lower pollution in the atmosphere. With this engine upgrade, each vehicle now achieves a 90% reduction of particulate matter and 50% less Nitrogen Oxide (NOx). Every new GMC pickup with the available Duramax 6.6L V8 Turbo Diesel engine has been engineered and built to provide the performance you expect, with even more positive results.

Why less is more.

Nitrogen Oxide (NOx) is a bi-product of the internal combustion system found in diesel engines. When exposed to oxygen, NOx combines with water vapour in the air to produce a harmful acid, which can do damage to the exterior of your vehicle. Also, it can mix with other airborne nitrates to become harmful to people, plants and the environment. During an emissions test, the amount of Nitrogen Oxide released into the air is measured, and can be the difference between a passing or failing grade.

Built bigger. Built better.

When it comes to improving the exhaust system, we didn't hold anything back. Thousands of tiny cells trap particulate matter inside, while allowing exhaust to be released through the sides of the chamber. The onboard computer in the engine will examine the exhaust pressure, and when necessary, start the burn-off process where the heat of the exhaust turns them into soot and ash, rather than allowing these combustion bi-products to escape into the atmosphere. The truck will need to drive 50 km/h for approximately 20 minutes to complete the cycle. As well, the Exhaust Gas Recirculation (EGR) and the Positive Crankcase Ventilation system (PCV) now found in all GMC models will reduce the production of harmful emissions - while improving the performance and fuel efficiency of your engine.

Here's a quick look at some of the new features in the Duramax 6.6L V8 engine:

• Additional combustion control with a more efficient variable-geometry turbo system
• Additional exhaust control, including an oxidizing catalyst
• New Diesel Particulate Filter (DPF) to reduce soot and particulate matter
• Increased-capacity cooling system
• New engine control software
• New high pressure Piezo electric fuel injectors