hi i was wondering what would happen if you run normal pump gas and not 91 octane

[tantrumpipeline]

I have run 87 in my 11 a few times to get out of the mountains, ran no different than 91, no codes, it wasn't something I'd suggest to do as they specify 91 as that's how they're engineered but I have several friends who get free fuel when in camp and run it in 09-10-11-13 cats and nobody's ever melted down or had a problem yet, I think people are pretty overkill on this site a lot of the time, look at any threads regarding oil and you'll see it

 

[moyiesledhead]

this guy has it
in my stock motor race sled 87 octane got the best power but has higher risk of pre detonation. in your m8 the motor has higher compression so it requires a more stable fuel.

Arrrrrgh! I hate it when people use "pre-ignition" and "detonation" interchangeably like they're the same thing. They're not!

Engine Basics: Detonation and Pre-Ignition: Streetrod Stuff

 

[MP Kid]

Arrrrrgh! I hate it when people use "pre-ignition" and "detonation" interchangeably like they're the same thing. They're not!

Engine Basics: Detonation and Pre-Ignition: Streetrod Stuff

So true!

 

[lsone]

it'd probably run like a bag and gum your injectors up.

lower octane does not gum up injectors.

 

[S.W.A.T.]

probably nothing will happen, someone will have a horror story though. Its recommended that you run higher octane, as it is in any high performance equipment. I personally mix in a gallon of c-111 with my 91, is it necessary? no but I do it.

 

[SUMMIT TREE]

Yeah, what they said! ( its not a scam between the sled makers and the big oil companies, you really do need premium)

 

[nany387]

out of all them replies knowone answered his question. to answer your question. higher octane fuels burns slower and produces less heat. hence less detonation. plus ive found fuels like chevron 94 are not pipe line fuel. they truck it in. way cleaner. take a clear container when ya fill up with regular fuel next time. couldnt believe the color and crap in the bottom of the can.

finally thank you and yes the same with 2 strike oils I checked out the bottom of a container of regular ufa oil and was amazed by the sluge and crap in the bottom (I only run cats oil)