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GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

Submit your questions for Autoblog Podcast #313 LIVE!

We record Autoblog Podcast #313 tonight, and you can drop us your questions and comments regarding the rest of the week's news via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
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2014 Chevrolet Silverado and GMC Sierra introduced

Chevy Malibu rolls over 10 million on the odo

On the cusp on the introduction of the latest model, the Chevrolet Malibu is celebrating a major milestone with 10 million of them now on the road since the car's introduction 51 years ago. While not quite enough to rank among the best-selling vehicles of all time, the feat is impressive considering the name took over a decade off from the Chevy lineup in the '80s and '90s. The Malibu started life in 1964 as the top trim on Chevy's new, midsize model, which also included the 300 and Chevelle. Offered in a plethora of body styles, including a wagon and convertible, the Bowtie brand moved over 370,000 of them in the first year. By 1969, sales reached more than 503,000. However, the market for rear-wheel drive sedans eventually softened in the US, and the Malibu name was dropped in 1983. The moniker returned in front-wheel-drive form in 1997 and has been a part of the lineup again ever since. These days, the Malibu is obviously only available as a four-door, but the model is more efficient than ever. The larger, lighter 2016 example can get up to 37 miles per gallon highway with its 1.5-liter turbocharged four-cylinder or 47 mpg combined when the hybrid goes on sale next year. You can get a great look at the Malibu's changes from the original until now in the gallery above. Related Video: MALIBU MILESTONE: 10 MILLION CUSTOMERS SERVED 31/08/15 Venerable sedan's 51-year legacy strongest in U.S., China and Korea DETROIT – Fifty-one years after it was introduced as Chevrolet's first midsize car, production of the venerable Malibu sedan has crossed the 10-million mark. Chevrolet celebrated the sales achievement today for the global sedan in the United States, China and Korea, which collectively account for more than 90 percent of sales. The Malibu is sold in more than 25 markets around the world. "The Chevy Malibu joins an exclusive club of vehicles that have achieved this extraordinary milestone and we acknowledge it today by honoring the common thread linking every one produced: The customer," said Alan Batey, president, global Chevrolet. "Some people are buying their very first Malibu today and others may have driven a Malibu from a different generation as their first car. It is a car that has resonated with customers for more than half a century." Chevrolet's interaction with customers has evolved since the Malibu was introduced in 1964. Back then, an owner's manual and a personal relationship with the dealer defined conventional customer service.