If you operate a Chevy Silverado MD truck in California, including either the Silverado 4500 HD, 5500 HD, or 6500 HD, you may have noticed that the truck is outfitted with a small, oval sticker that shows an outline of California state and text that reads “Certified Clean Idle.” Now, we’re taking a closer look at what this clean idle sticker means and why the Chevy Silverado MD has one.
Back in 2008, the California Air Resources Board (or CARB) mandated that diesel-powered trucks with a gross vehicle weight rating (GVWR) of 10,000 pounds or more were not allowed to idle for longer than five minutes. The regulation was intended to reduce emissions and save on fuel, while vehicle owners and drivers that break the law can face fines ranging between $300 and $1,000.
Naturally, there are a few exceptions. For example, trucks can still idle while stuck in traffic, or when it’s necessary to service or inspect the vehicle, or when stuck due to adverse weather conditions or mechanical failure, or a few other reasons.
The Chevy Silverado MD, which is equipped with the 6.6L V8 L5D turbodiesel Duramax engine, is given an exception as well, as indicated by the clean idle sticker. Although the Chevy Silverado MD has a GVWR over 10,000 pounds, drivers can continue to idle the truck for more than five minutes without running the risk of incurring penalties in California. This is particularly useful when waiting at a job site to keep the cabin either cool or warm, depending on ambient temperatures.
As for specs on the clean idle 6.6L V8 L5D turbodiesel Duramax engine, output ranges up to a maximum of 350 horsepower at 2,700 rpm and 700 pound-feet of torque at 1,600 rpm, all of which is directed through the close-ratio Allison six-speed automatic transmission. Notably, the Chevy Silverado MD is available with either rear-wheel drive, or four-wheel drive.