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87 Octane in 6.2L

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aczr2k Enthusiast

aczr2k

Posted
Posted

Exactly... Almost none of these engines are using there full potential. Its not like we are running laps at nascar or wide open down the dragstrip. And by the way I run only 87 in my RZR 1000 as that's what is recommended and that is a little higher performance than the 6.2L in the truck.

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OhmMega Enthusiast

OhmMega

Posted
Posted

You need the proper octane to match the engines design or modification. If it calls for higher octane, use it to ensure the longevity of the engine.

 

If it pings,knocks,detonates enough you can break piston rings, crack pistons, bend rods or deform the cylinder walls.

Isriam Enthusiast

Isriam

Posted
Posted

You need the proper octane to match the engines design or modification. If it calls for higher octane, use it to ensure the longevity of the engine.

 

If it pings,knocks,detonates enough you can break piston rings, crack pistons, bend rods or deform the cylinder walls.

 

i bet you could run a 6.2 on 87 octane for 200k miles and have no issues.

CptMcSaug Enthusiast

CptMcSaug

Posted
Posted

As long as your not making hot laps in it. If your drive like grandpa then 87 will work but most people with a 6.2 got it to either tow or go. So 91 or higher makes since. And it's only a few bucks more for a little extra insurance.

rmart Enthusiast

rmart

Posted
Posted

I'm pretty sure my owner's manual said that if I didn't run premium gas I'd void my warranty...

2014 Sierra 1500, 6.2L

Isriam Enthusiast

Isriam

Posted
Posted

I'm pretty sure my owner's manual said that if I didn't run premium gas I'd void my warranty...

2014 Sierra 1500, 6.2L

 

i don't believe thats something they could prove honestly. and if you even told them, i doubt it would stand up in court.

SMiller Senior Enthusiast

SMiller

Posted
Posted

I drove a new 6.2 today that was filled with 87 octane and just reving it up in park it would spark knock, pretty much tells the story...

redwngr Senior Enthusiast

redwngr

Posted
Posted

From 2015 OM:

For all vehicles except those with
the 6.2L V8 engine, use regular
unleaded gasoline meeting ASTM
specification D4814 with a posted
octane rating of 87 or higher. Do not
use gasoline with an octane rating
below 87, as it may cause engine
damage and will lower fuel
economy.
If the vehicle has the 6.2L V8 engine
(VIN Code J), use premium
unleaded gasoline meeting ASTM
specification D4814 with a posted
octane rating of 91 or higher.
Regular unleaded gasoline rated at
87 octane or higher can be used,
but acceleration and fuel economy
will be reduced, and an audible
knocking noise may be heard. If this
occurs, use a gasoline rated at
91 octane or higher as soon as
possible. Otherwise, the engine
could be damaged. If heavy
knocking is heard when using
gasoline with a 91 octane rating or
higher, the engine needs service.
Isriam Enthusiast

Isriam

Posted
Posted

 

 

Regular unleaded gasoline rated at 87 octane and higher can be used,

 

this is a discussion about CAN you, not SHOULD you. You can, and it will not void your warranty based on that sentence....

rmart Enthusiast

rmart

Posted
Posted

 

i don't believe thats something they could prove honestly. and if you even told them, i doubt it would stand up in court.

A friend of mine and I each bought 2014 Sierra SLTs with the 6.2L engine and we compared owner's manuals.

Both of them specifically stated that if the vehicle is equipped with the 6.2L engine (J code) that 91+ octane MUST be used or engine damage can occur. In the event that happens it could void your warranty.

I'll post the text from the manual tomorrow.

redwngr Senior Enthusiast

redwngr

Posted
Posted

Here's the same piece from the 2014 manual -- it also says 'Regular unleaded gasoline rated at

87 octane or higher can be used'
Talks about reduced performance, but not voided warranty.
"If the vehicle has the 6.2L V8 engine
(VIN Code J), use premium
unleaded gasoline with a posted
octane rating of 91 or higher.
Regular unleaded gasoline rated at
87 octane or higher can be used,
but acceleration could be reduced,
and an audible knocking noise may
be heard. If the octane is less than
87, a heavy knocking noise may be
heard. If this occurs, use a gasoline
rated at 87 octane or higher as soon
as possible. Otherwise, the engine
could be damaged. If heavy
knocking is heard when using
gasoline with a higher octane rating,
the engine needs service."
rmart Enthusiast

rmart

Posted
Posted

Hokay...

From my 2014 GMC Sierra Owner's Manual, publication# 23188200B page 9-68, 69

 

If the vehicle has a yellow fuel cap,
E85 or FlexFuel can be used in the
vehicle. See E85 or FlexFuel on
page 9-70.
For all vehicles except those with
the 6.2L V8 engine, use regular
unleaded gasoline with a posted
octane rating of 87 or higher. If the
octane rating is less than 87, an
audible knocking noise may be
heard. If this occurs, use a gasoline
rated at 87 octane or higher as soon
as possible. If heavy knocking is
heard when using a higher octane
rated gasoline, the engine needs
service.
If the vehicle has the 6.2L V8 engine
(VIN Code J), use premium
unleaded gasoline with a posted
octane rating of 91 or higher. If the
octane is less than 91, you could
damage the engine and may void
your vehicle warranty. If heavy
knocking is heard when using
gasoline rated at 91 octane or
higher, the engine needs service.

 

http://www.manualslib.com/manual/742194/Gmc-Sierra-2014.html?page=332#manual

http://www.manualslib.com/manual/742194/Gmc-Sierra-2014.html?page=333#manual

 

This was for my February 2014 build and my friends truck purchased three weeks ago, I don't know its build date.

rmart Enthusiast

rmart

Posted
Posted

I wonder if the conflicting information is brand dependent. ie. The Chevrolet manual says one thing but the GMC manual says another.

 

My truck's at the dealer today on another issue and I brought the fuel question up to my salesperson. He stated that it's there understanding that ALL of the vehicles they sell will run fine on 87 octane. I didn't ask if that also applied to the Corvette or the Camaro.

 

He went in back and asked the service department and their people had no definitive answers either but they did say that they don't typically test the fuel when they have a vehicle needing engine warranty work.

  • 5 weeks later...
Vanished Enthusiast

Vanished

Posted
Posted

My 14 gmc SLT allows has the reduced performance comment in its manual - built in July.. Regardless I've run the 91+

 

 

Sent from my iPhone using Tapatalk

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