Engine choice for new Yukon XL Denali (best reliability for next 3 years)

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rad92

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I've recently been posting about GMC configurator issues as I try to get the Denali Reserve package (for its SuperCruise, alongside other features) as well as the Premium Capability Package with Active Response 4WD (included with Denali Reserve in MY2024, but separate option for MY2025, with configuration difficulty alongside Duramax).

Starting a new thread here to request advice on Yukon XL engine choice from more experienced members --- between the 6.2L V8 and the 3.0L Duramax (both LM2 on a new-on-lot MY2024 or LZO on new-to-order MY2025 are options). The 5.3L V8 is not under consideration.

Our situation is that we are a one-car family, and this would be our only car for our family of seven. We live in a semi-rural / rural mountain area, with all that typically involves:

(1) Elevation of 4000-5000 feet
(2) Annual snowfall of 3-6 feet
(3) Private gravel roads for the last few miles to our house until paved county roads
(4) Only one GM (Chevy / GMC) dealer / service-center within 1-2 hours of home
(5) Lots of daytime driving, but also significant nighttime driving (it gets dark at 5pm in winter)
(6) Monthly mileage of approximately 3000 miles (yes: 30,000+ miles per year), most of that on highways or rural county roads with little stop-and-go

Also, please assume:

(1) Frequent oil/filter changes
(2) All recommended maintenance done on schedule
(3) Disable of auto-start/stop technology

The high mileage is a particular cause of concern for us, given that there doesn't appear to be any bullet-proof engine for a new Yukon (XL) --- they all have different (seemingly early) failure modes. This post looks for advice on which is the one that might best meet our needs.

Due to concerns over engine reliability, as well as how quickly new safety features are being introduced for cars now-a-days, we plan to replace this Yukon XL after 2--3 years (with a new large SUV, probably another Yukon XL), since that would be 60,000 -- 90,000 miles.

We figure that all warranties will expire (in our case) based on mileage, rather than calendar years, so we view them as follows (when driving 30k+ miles per year):

(1) Bumper-to-bumper (@ 36k miles): Good for 1-year for us
(2) Powertrain (@ 60k miles): Good for 2-years for us
(3) GM Protection Plan (8-yr/100k Platinum): Good for 3-year for us

I'll be purchasing the above GM Protection Plan at the same time as the SUV (not necessarily from same dealer, though, as I've read on this forum which dealers often most aggressive pricing for GMPP).

Our significant concern is to avoid ever being stranded --- this is particularly top-of-mind for my wife, when she's driving kids around when I'm not also in the car. That's the reason we have in mind to only keep the car for three years, so we'll at least have some GMPP left for that third year.

Even so, I've read about very long (180 day?!?) wait times for engine replacement even under original warranty (especially with 6.2L), which gives us anxiety, as there are very few available loaner cars that will accommodate all of us safely. That's also driving the push for us to plan / budget for early replacement with another new SUV after just a few years.

But more than anything, we want to think hard about the gas vs. Duramax engine choice, given recent reports of the NHTSA investigation into the 870k 6.2L V8 engines. If reliability were the same, we'd definitely get the 6.2L V8, as my wife prefers that (given past familiarity with gas engines) and she'll be doing more of the driving (for kids' pickup/dropoff/activities). But reliability is going to probably end up driving this choice more than anything.

Please completely ignore the following factors in engine preference:

(1) Resale value between different engines (ie, cost)
(2) Fuel mileage between different engines (ie, cost)
(3) Towing benefits of Duramax (we tow very occasionally to never)
(4) Longer-term engine reliability (ie, above 150k miles, since we plan to replace at 3-years, well before that mileage)

Along with your opinion on engine choice, I'd really appreciate if you could provide an explanation for why you think that way. Finally, if you vote for the Duramax, please let me know if you have a preference between the LM2 vs. LZ0.

Thanks so much for reading such a long post, and providing your thoughts.
 

jfoj

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Not sure there is a "good" answer.

The 3.0l Duramax has had some issues. They also have a cogged rubber belt inside the rear of the crankcase that drives the oil pump. Some indications are this belt needs to be changed around 100k miles and it costs around $3000 or so as I recall, maybe more. The transmission needs to be removed to replace the belt.

There have been problems with the DEF tank level indicator and there have been problems where the engine goes into some sort of "limp" mode as I recall and some have indicated an illusive antifreeze leak somewhere in the intake piping as I recall. You should search and you should be able to find more info on all of this.

The 6.2l, well there is not a good track record here either. Some think the newer build engines may have less issues? Time will tell.

I am hearing running 0W20 in either of these engines is not wise, suggest using 5W30 or 0W40. Change is by the time the OLM hits 25% life left on the oil.

For the 6.2l look into something like the Range DFM bypass module as well.

Kind of sad that these gasoline V8's do not last like the 6.0l version, my 2005 6.0l Yukon has 275,000 and counting, still have it, rusty rocker panels and all! It owes me nothing at this point.
 

PPK_

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I have a ‘24 with a 5.3 which i did due to lots of problems with the 6.2. I have had four 5.3s and never had any problem with them.. i also have a ‘25 sierra with a 3 liter in it. I think it is noisy like most diesels are and gets 28 mpg. I think the first version with cast al pistons is much quieter.

I have had all my 5.3s all over the country and do fine and what altitude you speak of won’t make much difference. If reliability is what you want.. i am not sure those picks in engines will do it.

On diesels.. i have had quite a few of them. On one VW.. i waited for two glow plugs not working before i changed all four out. Got my new glow plugs.. went to change them out.. very last one i could not get out. Big deposit on it. Had to take off manifolds and all other stuff up top to change it out. That is why i don’t like diesels. Instead of an hour it took weeks to get gaskets..

If you had a diesel before.. then you know this.. they are a lot of maintenance.
 

Stbentoak

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Watch this and more importantly read all the comments and you'll have your answer.

As far as the oil belt goes. somebody certainly poisoned people against this early on. And sadly, people still think it's an issue. I've never heard of one being replaced. It's warranted to 200,000 miles now. What do you want it to do? Laat a million? 99% of owners will never keep them that long, and even if they do, they will have had plenty of experience by then to do it efficiently. Simply not a concern.

AFA maintenance goes, really another misconception. I can change my own oil and filter for 70 bucks. Put in DEF from Wal mart once every 6 months for less than a drive thru meal.
Fuel filter 30 bucks and 15 min max good for 30K. Returns far superior mileage and doesn't need premium. Certainly, no more than a gas model....

Dependability? Well, my wife visits my children and grandchildren three hours away once every two weeks and many times drives by herself. I would never send her off in a 5.3 or a 6.2. Any motor can certainly have issues including this one. But if you look at the Duramax Forum, it's mostly pretty boring. Sometimes it goes days and days with no posts. not something you see in the other columns. It's made that trip at least 75-100 times. 350-mile trip and usually uses about a half a tank total. Not a whimper out of it... That is why another LZ0 is on order and worth waiting for. Best Hwy/Traveling vehicle I've ever had.
 
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rad92

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Hi all,

I should have mentioned that I've already read (in detail) the late 2023 DMax vs 6.2L thread here on TYF.com. Also, prior to my original post, I watched the above review by Getty's Garage, as well as some of his other reviews as commercial diesel mechanic, such as his complementary review of the 6.2L (on a GMC Sierra 1500 pickup).

Still, it's hard for me to get a clear idea of which is more reliable in the usage range I'm considering.

I'm actually not at all concerned with replacement of the Duramax oil-pump belt at either its original 150k or new 200k service interval. That probably won't even impact us, if we just plan to trade-in (for new) the entire SUV at 3-year / 100k interval...

The key thing in this post is that I'm NOT concerned with a known extra cost maintenance item that I can just plan for (like oil-pump service). I'm very concerned with the possibility of my wife driving alone with five kids and getting unexpectedly stranded in the middle of nowhere (which is case for most of our driving), where nearest town or gas station or tow-truck might be an hour or two away.

Thanks for the input so far. Please keep it coming!

(Also, not looking to start religious war between turbo-diesel and na-gas, which is what seemed to have in thread from 2023 that I link above...)
 

blanchard7684

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I’ll chime in to say that the 5.3 gets an undeserved bad rap. I’d drive one before you make a decision.

I had same negative preconceived notions . Then I drove one and came away impressed.
 

CMoore711

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Though I’ve never owned a vehicle with the 5.3; I was in a ‘21 Yukon XL SLT with 5.3 and 10 speed and I will say that the 10 speed helps the 5.3 a lot! I will say I wasn’t as disappointed as I thought I might’ve been.
 

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