si_ponz

Hey guys, just a wondering question, got a 2000 ek coupe, not boosted or anything, does putting high grade gasoline like every fill up harm the engine? Ppl have told me that its not good and that you should fill up with regular and put high grade once in a while to clean it up.

Just wondering if this is true or not.

Polkaroo Killa

No difference at all.
Just will make your wallet a little lighter.

Higher grade gasoline is used in performance engines to help prevent detonation.

chris_v2

rrrrrright..

The fuel is harder to burn so theoretically you will may have some un-burnt fuel left over, even if its a small amount, overtime it will wreck o2's and cat's.

Polkaroo Killa

rrrrrrright.....un-burnt fuel......suuuuuure buddy.

LEITNER

the octane is for detonation prevention. the higher the octane the higher resistance to detonation. if your car only needs 87 then running 94 is a total waste of time and money.

dont know about the o2 and cat but chris is a pretty smart guy so its worth investigating...and this is the internet so everything you read should be double checked.

sunoco has good info on their site and really....who would you listen too, us or them?

Nova_Dust

Keep it to what the owner's manual recommends. That's what I would do.

fingolfin

They did a study in car and driver magazine with a bunch of cars running regular gas and higher octane.

I remember the accord actually lost wheel horsepower with the higher grade gas. The Ford F150 Lightning and the M3 both lost power on the regular gas (which is expected).

Therefore..... its a waste of money if you don't need it...

Newbreed

I always put 91 in my EK. I find that I get better gas mileage. Yes it cost more, but due to the extra mileage I get, it makes up for it. I've had no problems what so ever with my cars in the six years I've used this grade of gasoline.

Also some of the higher octane gasoline claim to clean your engine and to be more environment friendly.

Petro-Canada Superclean (91 octane) - http://www.petro-canada.ca/en/produc...vices/322.aspx

Sunoco Ultra 94 - http://www.sunoco.ca/default.aspx?ID=2390

I think 94 is overdoing it a little bit, unless your setup calls for it.

k_r_a_c_k_e_r

iTrader: (3)

heard the same thing a few few times before too.

chris_v2

lol. okay, don't believe me.

Octane is a measure of how much the gasoline can be compressed before it ignites. Meaning a very high octane will not burn in a very low octane engine because the conditions are not ideal for that fuel. If you introduce a higher octane fuel into a lower octane engine, not all of the fuel is going to be combusted.

Now, when your compared 94 or 91 to 87. I'm not saying there is going to be a ton of unburnt fuel leftover, but I bet you there are a few more HC PPM in a d16 that uses 94 octane over 87 octane. And incase you didnt know high HC is not a good thing..

Polkaroo Killa

Thank you Bill Nye The Science Guy

chris_v2

your just butt hurt because i proved you wrong. It's alright.. i understand

Polkaroo Killa

Actually, no I'm not 'butt hurt'.

Your explanation is sound and makes sense.
Bill Nye is a smart guy, so take it as a compliment bud.

360_vortex

ok i think the OP got his question answered