cmomcilo

I have question about fuel for 97 Protege 1.8L.

From time to time I use super with 92 or 94 octants but I am little concerned if it is OK or I have to use only regular with 87 octants

Manual says that my car performs the best with regular.
Is that strict rule or I can use beter fuel grade for beter performance.

Thans very much,
Momo

Bruce95fmla

my friend you can use , 87,89 or super if you want , heck you can go to sunoco , and get that ultra high octane feul if you want , my car runs way smoother when I use special and even better in super, .....
Bruce

turbonium959

I noticed best runs on 89, on my 1.5 liters. I would not recommend running ultra all the time, as you might burn out your gaskets (they were not designed for it). It would suggest 87, or 89. You will not notice power difference at all, just smoother running, I think.

Prem0

The main reason for higher octane fuel is for a hotter longer burn. How does this benifit me you ask, well its main purpose is to clean your fuel system and engine parts involved in combustion. The only other reason to run high octane fuel is if your compression ratio is high (like 11:1 and above), my 95 1.5L LX has a compression ratio of 9.25, the newer cars are usually around 8.5. I use Berryman B12 about every 3rd tank of gas to keep my injectors clean..

turbonium959

That is true, but no matter what kind of gasoline you use, your injectors will still get dirty from the combustion process. Unless you do a professional injector cleaning, you will not clean much. They do those at Jiffy, I used to work and do them. They will hook up the cleaning fluid right into the intake, and man some cars had so much soot coming out, and customers would come back saying how much smoother their cars run. As for the $3-5 cleaning fluids that you can get at NAPA, PepBoys or else, they will clean much but for only one oilchange. Remember, your engine gaskets were made for lowest octane gasoline, and if you keep on using higher octane gasoline for a long time, you will burn them, and then your oil will be showing all over the engine. It will look like sh*t, and cost you pretty penny to replace the gaskets!

cmomcilo

Thank you all guys.
This is really amusing how much you can halp others.
My appreciation.
Momo

turbonium959

I was referring to the gasket between your block and the valve cover. By running higher octane you are increasing the compression ration, thus running higher temperature. That gasket is not very durable if used with higher octane gasoline. It will be burned little by little, plus the highed compression ratio would put even more pressure on it. I ocasionally use Gumout Injector Cleaner, and run either 87 or 89. It has been running smoother for me at that octane than 93.

turbonium959

[QUOTE]Originally posted by PseudoRealityX
[B]

Ok, first of all, there IS NO gasket between the block and valve cover.

I guess thats is/are the gasket(s) I was trying to reffer to. I might be wrong about them burning out, but the compresion ration increase was not my idea, I was only repeating what PremO said. I am apologizing if I have miss led anyone. I was only stating my opinion.

turbonium959

Check out this link, it is from a goverment website.

http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm

It explains everything.

Prem0

[QUOTE]Originally posted by turbonium959
[B]I did not state that higher octane fuels raise your compression, I said that the higher your compression the higher octane fuel that must be used (the damn thing wont even start). I hope this clears that up..