Power Specs Leaked for GM's New Inline-Six Diesel

Matthew Guy
by Matthew Guy
power specs leaked for gm s new inline six diesel

While diesel may be deader than disco in the passenger car segment, it is rolling plenty of coal in the half-ton pickup truck class. Once the domain of heavy duty rigs, oil burners are now snaking their way under the hoods of consumer-grade trucks.

We’ve known for a spell the output of Ford’s half-ton PowerStroke, as we have with Ram’s on-again-off-again EcoDiesel. Now we learn GM’s rating and, compared to that pair of competitor mills, it can brag about being best in class.

According to a report from the good guys at TFL Truck, who confirmed the numbers with GM reps, the new 3.0-liter Duramax Inline-Six Turbo-Diesel will make 277 horsepower and 460 lb-ft of torque. The latter comes online at just 1,500 rpm, lending credence to the assertion that this engine will pull tree stumps at near idle speed. It’ll be backed by a 10-speed automatic transmission, by the way.

According to the GM fleet order guide, the diesel mill will be available in several different trims and not limited to just the high-zoot models. Bowtie fans will be able to spec this engine in LT, RST, LTZ, and High Country models. Those first two will require the inclusion of a Convenience Package, driving the price up a bit more than by just the diesel upcharge. On the GMC side of things, this engine will be available on everything except the base Sierra.

If you’re paying attention, you’ll have no doubt deduced that Chevy Trail Boss trucks will not be available with the Duramax, but it is an option on the off-road focused GMC Sierra AT4 and its 2-inch factory lift kit. It remains to be seen if the diesel will be available in conjunction with other groups like the NHT Max Trailering package. Keep in mind that GMC offers the hand-of-god 6.2-liter in the AT4 as part of an Off-Road Performance Package.

For context, Ford’s Powerstroke is rated at 250 horsepower and 440 lb-ft of twist. Ram’s EcoDiesel, currently in the throes of drama and not yet available on 2019 models, heaves out 260 horses and 442 lb-ft of torque. In the never-ending Detroit truck battle, usurping the competition in power numbers is as natural as breathing oxygen, so expect one of the other two manufacturers – probably Ford with its 2020 F-150 later this year – to juice their numbers accordingly.

The new Duramax diesel now shows up on GM’s fleet guide, indicating orders will soon be taken for delivery later this year. Pricing for this straight-six option has not yet been released.

[Images: General Motors]

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4 of 29 comments
  • Trucky McTruckface Trucky McTruckface on Mar 22, 2019

    Too bad that diesel isn't accompanied by new sheetmetal and a better dashboard.

    • See 1 previous
    • John John on Mar 22, 2019

      Too bad RAM can't purchase this engine along with the 10 speed auto and stick it in the RAM 1500 crew cab short bed.

  • Tele Vision Tele Vision on Mar 23, 2019

    My lowly 2010 5.4L Ford came with 320 HP and 390 ft/lbs. It attains these figures on the cheapest gas available and without a turbo and CDN$1000 injectors. One would have to commit to regularly using the inherent capabilities of that truck for it to be a 'good deal'. The iron block might stand up to incessant towing but not much else will. That's a moot point, though, as we know that these trucks are just commuters - just as my truck is.

  • Jeff S The question is how long will Ford offer the Mustang as a pony car? Dodge is sun setting the Challenger at the end of this year and it is doubtful if the Challenger will come back as an EV. Rumors are the Camaro name will be used on an EV and that will mostly likely be a crossover. There is not enough market for a Detroit muscle or pony car. It is sad to see not only the last of the cars like the Camaro and Challenger go but to see most cars go. Soon this site will have to change its name to The Truth About Trucks (TTAT).
  • Oberkanone Does GM build anything to compete with this? Does GM build any competent hybrids?
  • Dukeisduke So, it'll be invisible, just like all other Gen 6 Camaros?
  • Alterboy21 The gov't has already mandated control of your vehicle. 10 years ago they required cars to have ABS and traction control.I am not sure I agree that automatic breaking is ready for primetime, but taking control of a cars driving behavior is not new ground for the NHTSA. 
  • Parkave231 Collector's Edition hood ornament or GTFO.