What will happen to a car if you use an octane too low?

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Hey I'm just posting for a "Friend" here. He has been filling his car with 89 octane since August... he jsut recently found out the gas mileage problems were caused because his car requires 92 octane. He is wondering what damage could have been done filling up the car with the lower octane since August. Thanks

posted by  Pythias

If the octane of your fuel is lower than required based on the engine's compression ratio, you'll get knocking (or combustion of the fuel before the spark). As for what damage this does to the engine (apart from inefficiencies).... you'd have to talk to the mechanics here.

posted by  windsonian

Apparently the DOHC neon takes at least 92 and I didnt know that because everyone convincedme it was a POS so I thought it took the 89 octane gas. The car wasnt running very smoothly, nor was it performing well. A few days ago I put premium in and what a difference it made. The engine is smoother, feels more powerful, and its quieter. Does anyone know EXACTLY whre I can find this information about what gas my car needs. I dont have an Owners manual.

posted by  newyorker

Some cars theres a sticker behind the gas door.

posted by  PontiacFan27

Yea I checked but it just says "Unleaded Fuel Only"

posted by  newyorker

that means you only rele need 89 or 90, cuz 91+ is called premium. not saying you cant put it in, but it is more expensive and it can increase performance

edit: check your owners manual to, it will say the actuall octane and cetane rating you nedd there

later ill get my manual if no1 gets it and show you what i mean

posted by  ride3k

I know it says it in the manual I even asked on a Neon forum, but i dont have the manual for myself.

posted by  newyorker

This is directly from carsuvey

I really have had no problems with this car. My only complaints are: 1. A sound that comes from the passenger side window at high speed, this can be fixed by removing the antenna, 2. It tends to lose power over 8,000 feet (I live in Colorado).

I love the acceleration, I have made very few modifications, I changed the air filter to a Fram AirHog, and added a sport racing chip. Now I do 0-60 in 5.2 seconds, and I can outrun a Camero anytime.

The simple design makes installing aftermarket parts very easy, even for someone with no mechanical knowledge (like me).

I have heard that DOHC neons don't run well after 40000 miles. I think these people are just not using the right gas. You have to put 91 octane or higher in this car. I also put "STP Octane Boost" in every time I gas up. Regular oil and coolant checks are also needed.

The car handles very well. I wouldn't try power sliding without 17" drift rims and a lower suspension though.

I feel sorry for all the people with faulty neons. But you have to realize that if one or two thousand neons break down, that doesn't mean all 135,000 of them are bad.


I really like the part thats underlined

Also this is from some site



Some vehicles, such as Viper, Prowler, 5.9L Grand Cherokee, 2.0L Turbo Talon, and 2.0L DOHC Neon have been specifically designed to take advantage of higher octane.These vehicles may have higher compression ratios, and/or more aggressive spark calibrations which provide optimum performance with the specified higher octane

posted by  newyorker

well, i'd take that with a grain of salt. they say "I wouldn't try power sliding without 17" drift rims".

power sliding in a front wheel drive? that is impossible. you can drift, but not power slide. power sliding, by definition, requires the car to be pushed from the rear.

if they're wrong about one thing, it should be seen as possible that they're wrong about other stuff too.

posted by  pik_d

Yea but clearly thats not the only source that shows what im talking about. I will get a service manual and show you all.

posted by  newyorker

I'm so glad we dont have this problem in the UK, we only have premium or super, premium generally being 95 octane, and super being 97... i run mine on optimax, lovely stuff!!!

posted by  Mk3golfer

I heard if you put sugar in your petrol tank everytime you fill up it raises the octane level. :laughing:

posted by  GreekWarrior

lol...


i seriously need a hobby

posted by  Mk3golfer

I'll show you all! You'll rue the day you ever dissed the NEON! Mwahahaha

posted by  PontiacFan27

And youll shut your hole because you have nothing productive to say here. :thumbs:

posted by  newyorker

No I wont :thumbs:

posted by  PontiacFan27

Wow I enjoyed reading this post, and best of all pontiac dissing the Neon "GOOD WORK" personally the car is junk, It's no different then owning any other cheap, eaxtremely affordable cars like the Civic. And dont tell me Civics are awsome cars, Sure you see them perform great but tell me how many original parts that guy has left under the hood? exactly, the car is nothing untill you put better quality after market parts in it. Personally I'm a truck fan so I guess my opinion shouldnt be counted.

BTW good work Pontiac vwHoBo would be proud of you!

posted by  mastersypro

Hes not too fond of me :ohcrap:

posted by  PontiacFan27

You dont even know my car. Id love to see your hunk of junk. And run the balls out of it.

posted by  newyorker

I wonder why :banghead:

posted by  newyorker

Stiff? Balls? Am I the only one who sees a pattern in his speech?

posted by  vwhobo

lmao your gonna make him cry!!!!

posted by  windman

its very phallic...

posted by  Mk3golfer

Maybe the condoms he buys twice a month are for him and his boyfriend to use

posted by  PontiacFan27

As long as he does it safely, I don't care what kind of sex he practices... Unless it's with one of my pets. :doh:

posted by  vwhobo

im sure the horses wont even notice!!!!

posted by  windman

But HE will if they get him turned around. :ticking:

posted by  vwhobo

Noone wants to hear your story.

posted by  newyorker

Ok enough is enough. My dick is my business. :banghead:

posted by  newyorker

Everybody already knows that. You can't find any girls interested in it, so you just take things into your own hands. Just make sure to wear a rubber so you don't get athletes dick.

posted by  vwhobo

LMFAO. That was funny even to me. Since were on the topic this is funny
Here (http://utterlyboring.com/archives/2003/11/16/who_says_men_cant_multitask.p hp)

posted by  newyorker

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