Does a 2024 Z51 with 6.2 require premium fuel?

tom3 · Jul 25, 2024

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.

Marky Dissod · Jul 26, 2024

tom3 said:
When I saw the 11 : 1 compression ratio on our 5.3L, I decided to run at least mid grade fuel.

Do you know the difference between spray-guided direct injection and port injection, specifically the one that allows engine makers to increase the static compression ratio?

To play your own devil's advocate, IFF the ecm recognizes higher octane fuel - it damnt well should - using higher octane should result in better MpGs.

tom3 · Jul 26, 2024

I know some about modern vs vintage setups. But when I'm cruising in four banger mode up a slight rise and I feel those 4 cylinders pulling their guts out I like to know the bit extra octane is there. Can't argue with the results - so far.

WalleyeMikeIII · Jul 26, 2024

TXt3rr0r said:
I'm not saying it's a good idea to do so, but my father drove his zr2 silverado for 8mo and never put a drop of premium in it, and he has a very heavy foot, never resulted in any issues in the 35k miles he had it

It won't get you in the first 35k, but may get you at 75k or 100k...there will be detonation if you use 87, the timing will retard to minimize it, but it won't ever be fully mitigated...over time, that may shorten engine life...at least that is my opinion...and matches what some mechanics have told me and what info I can find...

steiny93 · Jul 26, 2024

swathdiver said:
500 times a morning and evening and you soon have a worn out motor with busted rings and pistons at around 100K miles.

nope; that isn't how it plays out (but don't believe me; if it was occurring like you describe we've have piles of 6.2s with holes in pistons)

the current gen engines detect / prevent so well; engine longevity isn't impacted

Joseph Garcia · Jul 26, 2024

lt1gmc said:
You are right except I can afford the fuel, just not going to pay the ridiculous addition cost every fill up. The purpose of the question is to know it premium is required. I'm not going to buy it if so. Not pinching pennies, but not knowing the future I'm not going to lock myself into another premium only fuel vehicle, I already have 5. When premium was only .20 per gallon more was not such a big deal.

It sounds to me that you already made up your mind before you posted your rhetorical question regarding 6.2 octane requirements, and that is cool. You've received answers across the spectrum from the folks here in the Forum, and now you've got to draw your own conclusions.

IMO, @swathdiver has given you a pretty straightforward perspective on what goes on inside the 6.2 motor when various octanes of gasoline are burned in it.

Marky Dissod · Jul 26, 2024

swathdiver said:
You know how it adjusts timing? AFTER it detects detonation.
You pull off from a stoplight and it knocks, pulls timing. You give it some gas to pass a slow poke, it knocks and pulls the timing.
Do this 500 times a morning and evening, and you soon have a worn out motor with busted rings and pistons at around 100K miles.

These trucks are so well insulated that it is almost impossible to hear detonation and pinging with your ears. You can however watch it on a scan tool with live data.

I challenge fellas all the time to prove me wrong with the live data, no takers yet.

Anyone who bets against you will be sorely disappointed ...

swathdiver · Jul 26, 2024

steiny93 said:
nope; that isn't how it plays out (but don't believe me; if it was occurring like you describe we've have piles of 6.2s with holes in pistons)

the current gen engines detect / prevent so well; engine longevity isn't impacted

So what really happens then? Care to take the OBD live data challenge?

iamlegion · Jul 28, 2024

swathdiver said:
You know how it adjusts timing? AFTER it detects detonation. You pull off from a stoplight and it knocks, pulls timing. You give it some gas to pass a slow poke, it knocks and pulls the timing. Do this 500 times a morning and evening and you soon have a worn out motor with busted rings and pistons at around 100K miles.

These trucks are so well insulated that it is almost impossible to hear detonation and pinging with your ears. You can however watch it on a scan tool with live data.

I challenge fellas all the time to prove me wrong with the live data, no takers yet.

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.

tom3 · Jul 28, 2024

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

Does a 2024 Z51 with 6.2 require premium fuel?

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