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GM pauses 3.0-liter turbodiesel production due to a supplier shortage

General Motors confirmed it has temporarily stopped taking orders for trucks and SUVs equipped with the 3.0-liter Duramax turbodiesel six-cylinder engine. It blamed the last-minute pause on a supplier-related shortage. Website TFL Truck first reported the news, and a representative from General Motors quickly confirmed it. The spokesperson explained the issue is due to a "temporary part shortage" and added that production will resume "as soon as possible," meaning the Duramax engine (which is called LM2 internally) is not going away permanently. Additional details are not available, so we don't know if the issue is related to the ongoing chip shortage. Rather than delay deliveries and create a backlog, General Motors is reportedly asking its dealers to encourage buyers who want a turbodiesel engine to instead select either the 5.3-liter V8 or the 6.2-liter V8, depending on the model selected. Both are gasoline-powered units. There's no word yet on when Duramax production will resume. The shortage affects several models, including Chevrolet's Tahoe, Suburban, and Silverado 1500 and GMC's variants of these trucks. Cadillac's Escalade is temporarily diesel-less as well. Heavy Duty variants of the Silverado and the Sierra are not affected because they're powered by a different Duramax engine with eight cylinders. Motorists seeking a full-size SUV powered by an efficient turbodiesel engine are temporarily out of options because the Tahoe/Yukon and the Suburban/Yukon XL had the segment to themselves. The Duramax was surprisingly popular, too: in May 2021, GM Authority reported that the turbodiesel straight-six represented 8% of Suburban sales and 6% of Tahoe sales. Installed in a rear-wheel-drive Tahoe, the engine returns 21 mpg in the city, 28 mpg on the highway, and 24 mpg in a combined cycle, figures that make the body-on-frame behemoth more efficient than the unibody, front-wheel-drive Chevrolet Blazer that's 20 inches shorter and approximately 1,700 pounds lighter. Related video: 2021 Chevrolet Tahoe 3.0L Duramax engine

Chevy bringing Spark RS Concept to SEMA

Well, the SEMA mess has well and truly begun. Every year, an increasing number of automakers flock to the Las Vegas auto show, bringing accessories and concept vehicles that are both awesome as well as occasionally questionable. Chevy will bring an RS concept of the new Spark to SEMA, signaling that its styling package will be applied to the brand's smallest vehicle in the near future. We can expect the usual stuff in a production Spark RS – larger wheels, a slightly sportier cabin, a more aggressive body kit, and a small drop in ride height – but for the concept, Chevy wasn't restrained by things like budget. The front splitter, and sill extensions, foglight surrounds, and rear bumper insert are all finished in carbon fiber. The 17-inch alloys are apparently inspired by the Corvette Z06's Z07 package, while the Dark Liquid Switchblade Silver paint is broken up only by a driver's-side stripe. The company is also using SEMA to show its new Red Line accessories, features both concept and production parts for the Trax, Camaro, Malibu, Colorado, and Sierra. Every vehicle gets Enhanced Silver Metallic paint, a charcoal finish on the roof, satin graphite/red graphics, black/red badge kits, and aside from the Colorado, tinted lamps. Individual mods for the Trax include relatively simple tweaks, including new 18-inch wheels, blacked-out bowtie badges, a lowered ride height, and custom badging. It's a similar story on the Malibu, except that its 19-inch wheels are a smidge larger, and its lowered ride height is the result of a concept kit. The first concept based on the new Camaro opts for 20-inch wheels, while adding a few more performance items. The ride height has been lowered, there's a new air intake system, and an upgraded brake package. Chevy has also replaced the front upper and lower grilles inserts with red accents. On the pickup side of the coin, the Colorado gets 18-inch wheels, new intake and exhaust systems, Goodyear Wrangler Fortitude tires, and flared wheelarches. The Silverado gets similar intake and exhaust upgrades, as well as the largest wheels of them all, with 22s at all four corners. The full-size truck also gets a Brembo brake package, while every vehicle, aside from the Camaro, gets Thule roof-mounted accessories. You can check out all six concepts in the gallery above, and then be sure to keep an eye open for live images from the floor of the 2015 SEMA show, slated to open next month.

2021 BMW M3 and M4 vs all the high-powered sport sedans and coupes

Should you have a found a way to get past that schnoz, you've probably digested some of the basic specs for the all-new 2021 BMW M3 sedan and M4 coupe specs. They're plenty impressive. There's also, basically, two sets of them thanks to the regular and Competition versions that differ in engine output and transmission type.  But how do they compare to other ultra sport sedans and coupes? Well, we were wondering that too, so we fired up the Autoblog Comparison Spreadsheet Generator 5000 (aka me chained to my computer in a dark basement).  Sadly, there are surprisingly few competitors for the 2021 BMW M3. Rival sedans include the Mercedes-AMG C 63 and the Alfa Romeo Giulia Quadrifoglio, along with the Audi RS 5 Sportback sedan/coupe/hatchback thing. There's no more Lexus IS F, the Cadillac CT4 Blackwing has yet to arrive and Jaguar doesn't offer a spicy XE R.  Happily, there are more coupe rivals for the 2021 BMW M4, including the two-door versions of the AMG and Audi as well as the Lexus RC F. I also included the Ford Shelby GT350 and Chevrolet Camaro SS 1LE. On paper, they align incredibly well. On the street and on a track, I can personally attest that these Americans are fully capable of keeping up and/or bettering the fancy-pants luxury brands (and let's not forget there are even more powerful, hardcore versions available). If they don't align in terms of price or prestige, whatever. OK, let's get to the spreadsheet. Let's start with the coupes and note that I didn't bother listing the dimensions for the M4 Competition and C 63 S as they are identical to their "lesser" siblings.  I won't bother burning words explaining what you can see on the chart. Instead, I'll point out a few things that stood out to me. First, BMW M comes awfully close to matching the output of AMG's twin-turbo V8 despite having two fewer cylinders. Similarly, Audi manages to better the 0-60 time of the M4 Competition and tie the C 63 S despite being WAY down on power. It's not like it weighs less. Magic? Second, and speaking of 0-60 times, remember the importance that transmission and drivetrain make with them. It's not just horsepower and torque. An automatic will be quicker and easier to launch than a manual, while all-wheel drive provides more instantaneous and beneficial grip.