Anyone run 87 octane in their 6.2?

[Shadow17]

Truck came with a full tank.
Salesman told me not to waste money on high octane fuel.
Filled up with 87 octane but noticed the sticker on the gas flap said to use high octane fuel.
?????
Driving up a steep hill today with 1/4 tank left...the truck goes into reduced engine powered warning and the check engine light comes on!
I'm driving up the hill full throttle at 30 mph with a line of traffic behind.

Read the manual- check the cap, and then go to get some 93 octane.

Fill the tank and literally the warning lights go out and all is normal.

Wow!

 

[PinkAle]

Very funny NOT well now you know you don't need to run 93 octane but I would run 89 octane at a minimum. Engines are tuned to run different octane and the 6.2 is designed for high octane putting lower grade fuel in the engine increases carbon this affects the spark in the combustion chamber which causes knock decreased fuel economy and affects performance. You can use have premium half low grade fuel but all that does is make the octane 89 so it's easier to just use the better fuel. I would complain to the dealer maybe they would credit you some fuel

 

[02Burgundybeast]

I never run 87, if anything, i have added octane booster to the 93.

 

[powerhaulic]

i tried midgrade for awhile, ran ok
Have been using premium exclusively for the last 6k and have no regrets

 

[ezdaar]

I find it funny when people use 87, they all say the same thing.
"It saves me money".
No, it doesnt, it costs 10x the amount of money when the engine craps out due to the massive amounts of detonation it will have.

Never run that grade in anything that you care about.

 

[GM iraqi]

In my country we have only 75 octan and our cars run like mad dog lol

 

[PinkAle]

In my country we have only 75 octan and our cars run like mad dog lol

Is the method of rating octane the same as it is in the US it might say 75 octane and in the US it might equate to 105 octane I'm just saying

 

[GM iraqi]

Is the method of rating octane the same as it is in the US it might say 75 octane and in the US it might equate to 105 octane I'm just saying

No my friend Iraq is the leading country in the worse octan rates I'm sure of that

 

[hamd1719]

I had a Chevy Tahoe 2012 LTZ the dealer told me to put 95 octane, when I purchased Yukon 2015 S LT the dealer told me to put 91 I was surprised. But soon I heard something slapping in the engine. Took it to thee dealer, they did not have any idea. Did a research on the Internet there is bulletin for k2xx models to use highest octane available. Now I put 95 slapping gone .
P.s I live in Saudi

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[ezdaar]

That's called "detonation". Its very bad for engines.

 

[hamd1719]

That's called "detonation". Its very bad for engines.

Will it destroy the engine permanently or if i put higher octane it'll stop the damage caused by 91 octane

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[kuslamb]

95 Octane fuel? I can find 93 Octane around me, and 91 everywhere, but 95 isn't readily available as far as I know.

And when I was in NorCal these last 2 weeks and had a 2015 Yukon XL rented, I was suprised that the high octane at the local stations was 89 with some additive...

 

[hamd1719]

I live in Saudi here there two fuels available 91 and 95 but turns out 91 here isn't 91 but lower because car manual recommend 91 for 5.3 engines but mines slaps AKA detonation. So now I out 95

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[ezdaar]

yess it will permanently damage your engine. do not use a low grade fuel in modern engines.

 

[BMPNUGLS]

"Low Octane Tunes" that many programmers have will make the appropriate timing adjustments to lessen the likelihood of detonation with lower grade fuels.....of course at the sacrifice of power....but will help an engine "live longer" w sub par fuel

 

[cardude2000]

Have used 87 in my Tahoe for 4 years. No issues at all. Wonder how many miles of such egregious abuse this thing will take before my extended warranty has to buy me a new engine?


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[ccapehartusarmyINF.(ret)]

No my friend Iraq is the leading country in the worse octan rates I'm sure of that

yes i know exactly what yer talking about i was deployed there for 18 months and i saw what the fuel looked like the kids were selling on the side of the road it looked my piss when i was really dehydrated

see when saddam was in power in iraq everything went into exporting crude oil he literally put almost no resources into refining so gas stations were few and far between and the quality of fuel was very very low
and gas stations had lines down the block and around the corner

 

[ccapehartusarmyINF.(ret)]

always use what the manual says if it says use 87 use 87
it says use super unleaded use super
the octane rating is not the quality of the fuel its the flash point higher octane higher flashpoint
most newer motors have higher compression ratios wich create more heat
so when you put 87 in a vehicle with a high compression ratio you get detonation because 87 has a lower flashpoint its igniting to soon
but most newer engines nowadays will compesate for this thoughg

 

[GM iraqi]

yes i know exactly what yer talking about i was deployed there for 18 months and i saw what the fuel looked like the kids were selling on the side of the road it looked my piss when i was really dehydrated

see when saddam was in power in iraq everything went into exporting crude oil he literally put almost no resources into refining so gas stations were few and far between and the quality of fuel was very very low
and gas stations had lines down the block and around the corner

yes Chris if you have the chance to come back to iraq make sure to tell me
i will take to some places you never thought they are exist in iraq
like an entire area for chevy/gmc only

 

[JennaBear]

91+ for the 6.2L

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