Anyone run 87 octane in their 6.2?

Shadow17 · Sep 24, 2015

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 · Sep 24, 2015

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 · Sep 25, 2015

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

powerhaulic · Nov 25, 2015

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

ezdaar · Nov 25, 2015

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 · Nov 26, 2015

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

PinkAle · Nov 26, 2015

GM iraqi said:
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 · Nov 26, 2015

PinkAle said:
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 · Nov 30, 2015

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

Sent from my SM-N920C using Tapatalk

ezdaar · Nov 30, 2015

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

Anyone run 87 octane in their 6.2?

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