General Motors rolled out an all-new generation for the Chevy Tahoe and Chevy Suburban in conjunction with the 2021 model year, with the forthcoming 2024 model year originally expected to introduce a mid-cycle refresh for both SUV nameplates. As GM Authority covered previously, this is no longer the case, with the refreshed Tahoe and Suburban now expected to arrive for the 2025 model year, if not later. Notably, the 2024 Chevy Tahoe and 2024 Chevy Suburban will carry over the 3.0L I6 LM2 turbodiesel Duramax engine, rather than offer the new 3.0L I6 LZ0 turbodiesel Duramax engine.
For those readers who may be unaware, the 2024 Chevy Tahoe and 2024 Chevy Suburban were originally anticipated to offer the new 3.0L I6 LZ0 turbodiesel Duramax engine as a replacement for the 3.0L I6 LM2 turbodiesel Duramax engine offered currently. The new LZ0 engine was expected to be offered in conjunction with the 2024 model-year refresh. Now, however, with the refresh expected to arrive for the 2025 model year or later, the 2024 Chevy Tahoe and 2024 Chevy Suburban will continue to offer the 3.0L I6 LM2 turbodiesel Duramax engine as the optional oil-burner powerplant.
For reference, the 3.0L I6 LM2 turbodiesel Duramax engine is rated at 277 horsepower at 3,750 rpm and 460 pound-feet of torque at 1,500 rpm, while the 3.0L I6 LZ0 turbodiesel Duramax engine is rated at 305 horsepower at 3,750 rpm and 495 pound-feet of torque. The LZ0 is currently available under the hood of the 2023-and-newer Chevy Silverado 1500 and GMC Sierra 1500 pickup trucks. Those figures represent a 10-percent increase in power and a 7.6-percent increase in torque over the LM2, which are the result of new steel pistons, a retuned turbo compressor, new fuel injectors, and improved temperature controls.
The LM2 mates to the GM MQC 10-speed 10L80 automatic transmission, while the LZ0 mates to the GM MQB 10-speed 10L80 automatic transmission.
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Comments
Expecting to hear the same for the Yukon/Escalade in the coming days. Would be nice to at least have one LZ0 SUV option without all the bells and whistles (and dollars) of a refresh -_- but alas, it’s likely necessary to fit it under the hood.
Seems like a waste to build both engines. Also, I thought the block and basic externals of the engines were the same and the changes were internal and tuning. If true, they should be physically interchangeable.
It seems like GM either has a huge surplus of LM2 engines, or a huge surplus of parts used specifically to build the LM2. Otherwise, as Carl said, why build the LM2 AND the LZ0? Especially considering how GM appears to pinch pennies. (Except for the huge pay raise GM executives supposedly gave themselves recently) Further, considering the full-size SUV’s are (give or take) 500 pounds heavier, why delay giving them the more powerful LZ0?
I wish GMA was a little more active with reporting news and actually reached out to GM for comment. Basically the title tells us everything
Bring back the compact diesel. In a small vehicle.
I will purchase a new Tahoe when the L8T engine is offered.
Not happening. They won’t touch powerplants in the 1500-series vehicles until the new V8 is ready.
I have the L8T in the 2024 Silverado 2500 I just bought. Seems like a good engine, but keeping an eye on the oil level. PCV seems to have a good amount of blow-by based on the catch can that I installed.
It is old(er) school though with no AFM/DFM, which means there’s no way it makes it into the 1500’s, even if it would only probably eek out 1.5 MPG extra. I’m averaging almost 14.7 MPG in all driving with the 2500 (mostly unloaded), which I think is pretty darn good for a truck that curb weighs at ~7,300 lbs.
Not offering new diesel engine ,it is not so smart marketing. Current suburban which o own 5 of it. I am waiting new refresh suburban. New diesel engine if not be the case I will purchase Lincoln Navigator. Interior quality and nose inside cabin much better. We can not wait anther unsure time to order the new suburban. Go really special for upsetting their current clients.
Continued lifter issues on the gas engines with no satisfactory and real fix other than replace the junk parts with junk parts, oil consumption that may require topping up between oil changes called normal in the diesel engine (maybe normal for GM), delays, delays, delays and not offering the LZ0 just made my mind up to stick with Toyota. Having 2 SUV’s that each racked more than 200K miles with only one starter going bad between them after 200K, why waste money on GM.
i see literally no new full size toyotas here. but full of GM products. toyota fanboys in full copium damage mode
LOL – I actually had 2 Tahoes on order (Z71 with 6.2L and Premier with Diesel) – I have cancelled both due to well known and documented issues with gas engines and then waiting for refreshed 2024 (not happening) and LZO in 2024 Tahoe (not happening). So its not a matter of being a fanboy of this or that brand but simply going with facts – in the meanwhile, you just keep drinking the GM Kool Aid fountain and facilitate GM making subpar and very expensive transports for people just like you.
Anyone out there know if the changes are not happening until 25 , the talk of the Z71 and AT4 SUV finally coming with the diesel this year cancelled are as well ??
Would you think the Duramax LZ0 may be available in the Z71 trim ?
I would certainly hope so and would have definitely bought as long as they continued to offer the some of the same option packages (such as adaptive air suspension). Unfortunately GM is not saying a word about if and when the LZO will be made available or if the Z71 will get this option – Leaving customers in the dark means they lose customers like myself that cant sit on the sideline forever and will look at other options….. and so far everything that has come out of GM authority on the Tahoe refresh and LZ0 option has been totally incorrect!!
Steve & Tom:
Since ALL the full size GM SUV’s roll down the same assembly line, I think it would be really unlikely for them to be installing 2 different 3.0 Diesels. I hope I’m wrong, I really want that LZ0 too, but I just doubt it. I’m already driving an Escalade with the 6.2 gasser. It really scoots for a big vehicle, but that 12.5 mpg around town really stings…
Pretty sure there’s a problem with the LZ0. Lots of reports of it burning oil. These SUVs are represent the very wealthy. Reliability is key. Only reason I think they are keeping the LM2.
I was under the impression that a certain percentage of both LM2 and LZ0 engines consumed oil at rates that came close to or required additional oil between oil change interval. As a couple of earlier comments suggested, I think that it does not make sense to run two virtually similar engine options and it’s either a inventory purchase commitment or an overstock issue.
No LZ0 in the SUVs? Bummer. Looks like I’m not buying a new truck this year.