Does a 2024 Z51 with 6.2 require premium fuel?

tom3 said:

I suspect the reason we don't see piles of these engines with burnt up pistons is that most people do run premium fuel?

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swathdiver said:

So what really happens then?

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tom3 said:

I suspect the reason we don't see piles of these engines with burnt up pistons is that most people do run premium fuel?

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Polo08816 said:

We test drove a 2024 Yukon XL SLT with the LM2. The Duramax powertrain far exceeded what we expected as far as refinement to the point where it's under serious consideration. We have to test drive a 6.2L in the future as well although it's not offered in the SLT trim. We'll probably opt for the AT4 if we decided to go with the 6.2L.

We aren't basing our decision on fuel costs. It's really about whether the Yukon XL might end up being our primary tow vehicle in which case the exhaust braking could be useful. Or whether we enjoy the extra power of the 6.2L L87 and the linear feel of a NA V8.

I would expect the L87 powertrain to be easier to service as there's less going on in the engine bay. I don't expect the main bearings to be a persistent problem if the design hasn't changed. I do expect the lifters to be a re-occurring problem as this is a design flaw.

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lt1gmc said:

Looking at a new Z51 Tahoe with 6.2, and although the fuel economy isn't great, I sure don't want to have to pay $1 gallon extra for gas. Anyone know, the EPA states Premium but I don't trust the salesmen answering.

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Stbentoak said:

Well recently there has been a common theme of main bearings letting go on the crank due to bad clearances. If you search around you'll find an amount of both issues cropping up. Diesel vehicles also present a certain number of quirks over time, but I'm on my 4th one and by and large they have been very dependable. The LM2/ LZ0 combination if you look at most forums, really isn't that busy at all. A few crop up with issues or major issues, but by and large this format has been the best for these large vehicles. I personally bought an extended warranty for mine that will last me for as long as I own it. Right or wrong it will cover most any issues that come up after warranty and I don't lose any sleep over what just might happen.

Sad to see that the Escalade is dropping the diesel format for the future. I thought about maybe buying one as one of my last great vehicles in 25 or 26....

Also, if you are locked into premium, you will be paying the absolute highest price for fuel for the life of the vehicle @ an avg of 15 mpg. Diesels worst mileage is about 22 if you are pounding it around town...The gap from reg to prem could easily expand to 2.00 a gallon in a few years... What would stop them?

As far as sensors go, they certainly "can" be a problem, but they usually sort themselves out during the 3/36 period. If I had to throw 3-500 bucks at my vehicle a few times over its life beyond regular maintenance, that's certainly not a showstopper to me.

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tom3 said:

When I saw the 11 : 1 compression ratio on our 5.3 I decided to run at least mid grade fuel. When I'm around a Sam's Club I fill with premium, usually about the same price. Engine runs great and gas mileage is really impressive. But we don't put a lot of miles on it so the cost is not a big factor. I'd run the best fuel available in that 6.2 hot rod.

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