Manoli Katakis 
After perusing through GM’s dealer order guides, the 3.0L Duramax diesel engine is notably absent from the 2021 Chevrolet Tahoe, Chevrolet Suburban, GMC Yukon and Cadillac Escalade guides. It’s therefore become understood that the 3.0L Duramax diesel engine that will come in as an option would not be available at the launch of GM’s all-new T1 platform sport utility vehicles. And GM spokespeople have confirmed to MC&T this will be the case, with availability happening “later” in the 2021 model year. These new full-size GM utility vehicles are expected to begin production as early as next month, June, but we have exclusively learned that the rollout of the 3.0L LM2 Duramax for the GM T1 SUVs will not start until at least November.
This straight-six diesel engine is currently offered on the 2020 Chevrolet Silverado 1500 and 2020 GMC Sierra 1500 pickup trucks. While they will be offered on each new GM full-size SUV, they will not be offered on the Tahoe Z71 or Suburban Z71, nor the Yukon AT4 off-road packages.
General Motors has been busy refining and honing the LM2 Duramax, and evaluating how to improve certain aspects of it, such as how much it can tow. This would, in turn, require improvements in cooling systems at the very least. With this happening behind the scenes, don’t be surprised if the LM2 emerges better than it was before in a few months’ time.
At launch, the 2021 Chevrolet Tahoe and Suburban, 2021 GMC Yukon, and 2021 Cadillac Escalade will offer their V8 gas engines only. For Chevrolet and GMC, that means the 5.3L L84 V8 and the 6.2L L87 V8. For Cadillac, that means only the L87 V8. EPA fuel economy numbers, as well as towing numbers, have been published online. Despite these vehicles growing significantly in size – especially the short wheelbase Tahoe, Escalade and Yukon – it’s neat to see that these fuel economy numbers haven’t really dipped from the previous generation K2XX SUV models.
The General Motors Arlington Assembly plant in Texas is preparing to build its first T1 SUVs fit for sale next week.
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