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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.

Lexus GX and TX, and Volvo EX30 revealed | Autoblog Podcast # 784

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Byron Hurd. They've been driving the Mercedes-Benz GLB Class, as well as the Kia EV6 and EV6 GT. In the news, the new Lexus GX and TX SUVs have been revealed, Ram previewed its compact Rampage truck, Chevy has a Panther-inspired Camaro Collector's Edition, and Volvo unveiled is EX30 city EV. Our hosts take to Reddit for car recommendations, and to the Mailbag for beer tips. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast # 784 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving 2023 Mercedes-Benz GLB Kia EV6 vs. EV6 GT 2024 Lexus GX revealed 2024 Lexus TX revealed Ram Rampage is a 1500-like unibody truck for Latin America 2024 Chevy Camaro Collector's Edition pays tribute to Panther code name 2025 Volvo EX30 revealed Spend my Money Mailbag Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video:

Recharge Wrap-up: Tesla factory tour video, Obama rejects Keystone XL

Tesla takes us on a 90-second factory tour in a new video. In the footage, we see humans and robots hard at work putting together the electric cars we all know and love. Pieces of the manufacturing process are interspersed with larger shots of the factory floor. In the end, we see the finished product leave the factory and speed off onto a cone course. Check it out in the video above. President Obama has rejected the proposed Keystone XL oil pipeline. After a seven-year review, he says it would not be in America's interest to build the 1,179-mile pipeline to bring oil from Canada's tar sands to the Gulf of Mexico. He cites passing a bipartisan infrastructure bill as a better way to create jobs, says US gas prices are already falling, and that reducing reliance on fossil fuels is a better way toward energy security. "The industry can find a different way to move that oil," says Christine Tezak, energy market analyst at ClearView Energy Partners. "If prices go up, companies will get the oil out." Read more at The New York Times. Chevrolet is donating a 2016 Volt to support For Inspiration and Recognition of Science and Technology (FIRST). Donations raised from the auction will help the organization bring student robotics projects to communities in need of greater science, technology, engineering and math (STEM) education representation. "The Volt exemplifies technology, and behind the next-generation Chevrolet Volt is a diverse team of engineers who understand the power of science and math," says Chevrolet Marketing Director Steve Majoros. "FIRST brings science and math alive outside the classroom, just like we are bringing it alive on the road." Read more from Chevrolet. Nissan has been ranked among the top five percent of global corporations in the Carbon Disclosure Project's (CDP) 2015 Climate Change Report. Nissan scored a perfect 100 points in CDP's Climate Disclosure Leadership Index. Nissan's successful Leaf EV, as well as its efforts to reduce well-to-wheel CO2 emissions by 90 percent by 2050, earned the automaker its high marks. "Nissan is providing customers with innovative products and promoting effective use of energy and resource by increasing sourcing diversity, such as with renewable energy and recycled materials," says Nissan Corporate Vice President Joji Tagawa. "We will continue our activities to achieve our environmental philosophy of 'a Symbiosis of People, Vehicles and Nature.'" Read more in the press release below.