Does a 2024 Z51 with 6.2 require premium fuel?

tooleyondeck · Jul 29, 2024

yo this thread is WILD lol :popcorn:

JGinLA · Jul 29, 2024

SavageDad said:
I hadn't heard about Cadillac dropping the Duramax, did they specify what year? I was looking at switching from the Suburban to the Escalade in the next two to three years.

'25 Escalade is gas only according to reports.

BacDoc · Jul 29, 2024

This is always interesting!
I’ve heard stories of guys running 87 only and getting over 200k miles no issues. Also guys changing oil 10k miles or more and have 300k miles no problems!

I have patients who are mid 80’s and they have been smoking packs a day since they were 14 years old and never eat right or exercise and are still living!

It’s not really a question if anything is really necessary, it’s more like Clint Eastwood asking “well punk, do you feel lucky?”

If you buy a new or newer high performance luxury truck with a corvette engine and over 400 hp that will go 0-60 faster than most sports cars - for god’s sakes feed that amazing motor some premium fuel!

lt1gmc · Jul 29, 2024

swathdiver said:
$20 a fill mean that much to you in this day and age with a $80K car? You know that a $20 is the new $5 bill right?

Is the extra 65 horsepower worth it to you?

So with 5 cars taking high octane gas how is one going to make a difference? At that, you ought to put in a 300+ gallon tank and buy in bulk!

Because this one will travel 25k miles a year, like the 185K on the Current Denali.

lt1gmc · Jul 29, 2024

iamlegion said:
THIS.

I still don’t get how people have $80k to drop on a truck then want to have an endless internet debate about whether the extra $1/gal in a truck that does 16mpg is some sort of moral high ground.

I’m starting to think the venn diagram of people that finance these for 8 years and the ones putting 87 in them is a pretty heavy overlap.

I just asked a simple question. Others have made it an endless debate. Not a moral high ground. I expect to put 185K on my next one and an addition $20-22 a fill-up adds up. Doesn't really matter how much I pay for the new truck, that wasn't the question.

swathdiver · Jul 29, 2024

steiny93 said:
the slight knocks prior to timing being pulled are not enough to damage the engine; that's what happens, all the time all day long

if you were correct, every 6.2 running 87 would be dead on the side of the road; but that isn't the case
not sure what your odb challenge is supposed to prove; I'm not claiming knocks don't occur, I'm claiming they are not enough to cause discernable damage

Not every engine, but many engines after about 100K miles is what we've learned. They suffer from broken rings and or pistons. You don't see AFM cars piled up on the side of the road either but they do fail and need repair also.

Ok, so my claims come from watching videos of broken engines being torn down or repaired on youtube, accounts on these forums and personal experience. What do you base your claims upon?

The OBD Challenge was to show the naysayers that their engines do indeed knock and ping on low octane fuel.

lt1gmc said:
Because this one will travel 25k miles a year, like the 185K on the Current Denali.

All the more reason to feed it properly with high octane fuel if you intend to go the distance with it.

WalleyeMikeIII · Jul 29, 2024

lt1gmc said:
Because this one will travel 25k miles a year, like the 185K on the Current Denali.

I think for your application, get the 3.0 Duramax and don’t look back.

quick math, using these assumptions:
25k/year at 65% Highway/35% city.

So, 16,250 Hwy and 8,750 city miles.

Diesel, assume 28MPG Hwy, 20 City
Gas, Assume 19 MPG Hwy, 14 City

Diesel = 580 gal Hwy, 437 gal City = 1017 Gal
Gas = 855 gal Hwy, 625 gal City = 1480 Gal

Wild Card is pricing, but let’s use what I saw at the pump 2 hours ago when I filled up.
Diesel = 3.499
93 Octane Gas = 3.799

Annual Fuel Cost:
Diesel = $3558
Gas = $5622

Assume DEF to fuel 50:1, so 20 gal of DEF at $5/gallon = $100

Let’s call a gas oil change $110 and a diesel one $210.

Assume you need three a year:
Diesel = $660
Gas = $330

Then cost for fuel, oil, DEF
Diesel = $4318
Gas = $5952

BacDoc · Jul 29, 2024

lt1gmc said:
I just asked a simple question. Others have made it an endless debate. Not a moral high ground. I expect to put 185K on my next one and an addition $20-22 a fill-up adds up. Doesn't really matter how much I pay for the new truck, that wasn't the question.

You asked a great question and that’s why you got so many responses!

The answer to your question is just like the owner manual says, premium not required but “recommended”. You can run regular and not have any problems. You posted question on an enthusiast’s forum and that ignited debate and you got it! Lol!

Again, great question and the guys who responded are really enjoying the discussion whether they admit it or not.

Enjoy debate bro and don’t worry about the haters, it’s a question that has many answers depending on your position on the motor head scale. To some it’s just an expensive truck, to me it is a land yacht with a corvette engine that is worth feeding premium fuel and changing oil more frequently than the owners manual advises.

DontTaseMeBro · Jul 29, 2024

NorthGeorgia said:
I am somewhat hesitant to contribute here for fear of maybe not knowing what I am really talking about. I just purchased new a 2024 Tahoe 'High Country'. My ignorance is going to say I'm not sure what 'gas' engine I have but I will assume it's not the 6.2 being debated here? But I am going to say that I have been pleasantly surprised with the mpg's I got on a 450mile round trip I just took. On the way 'there' I averaged 24+mpg. On the way back I averaged 23+mpg. Admittedly I was only going 66mph on the highway. This is what the onboard 'computer' indicated. I think the window sticker indicated that this vehicle listed the mpg's at 14 to 18? So I am greatly happy and surprised or........the computer is not telling me the truth????

I was gonna blast you for being ignorant regarding what engine your vehicle has but you already beat me to it haha!

Anyways, yes, it’s the engine being debated here…

iamlegion · Jul 29, 2024

Northwoods said:
You can use 87 octane with no issues. I’ve had 4 Denali’s with 6.2 engines and have had zero issues.

Why do people say stuff like this?
I drive every day without a seat belt, I haven’t died yet…

Just like the premium fuel, the seatbelt is recommended in the event of a litany of potentially bad scenarios.

Just because it worked for you doesn’t mean it’s gospel.

Does a 2024 Z51 with 6.2 require premium fuel?

tooleyondeck

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