Hey everyone. My first question is concerning octane boosters and do you guys use them? If you do, please post which one.

Second question. My oil change is coming up soon and I was wondering if you guys use the recommended Mobil 1 Synthetic Oil or tried some other? My STI driving friend/rival suggested Elf Synthetic. Any suggestions on what would be the best choice?

 

i wouldn't worry about octane booster.

oil brand is based on experience and personal choice. just make sure you stick with synthetic.

 

I would stay with Mobil 1 synthetic oil. No i dont use octane boosters lol, that is like high school kids that think there are going to gain like 30 awhp with octane booters lol.

Now if the gas station only offers like 87 or 89 octane then hell ya get some octane booster.

 

Torco is the only "booster" I would spend money on.

the other crap in the plastic bottles is junk.

Mobil 1 synth is the ****

 

I would stick with Mobil 1 synthetic. It's good stuff.

 

I use STP Octane booster and STP Gas Treatment at the same time when filling up, Mitsubishi Manual recommends it, if you desire to do so. Everywhere I go, I just get 91 Octane....hopefully by using the booster and gas treatment I'm up to at least 92

Did the same thing with my Evo 8 and never had any problems and the car seem to even run better.

 

STP is useless crap. if you follow the mix ratio you gain MAYBE .2-.5 octane

waste of money.


REMEMBER: if your not tuned for a higher octane, YOU DONT NEED HIGHER OCTANE!

 

Octane boosters with foul your plugs out in a hurry..

Mobil 1 FTW.. Keep it simple.. No need to go crazy..

 

i used NOS octane boosters and when making logs in my evo8 the knock would go away and i could lean the mixture and advance the timing

 

Mobil 1 syn is tried adn true. Octane boosters are crap, if you really want to spend 5-10 dollars I can PM you my mailing address and you can mail it to me.

 

Well thanks for the responses guys. I'm happy to hear I will be able to save the extra 15 bucks off the boosters.

 

i once read that the manufacturers do not recommend these boosters ans the MMT and other additives are harmful to the stock fuel system...

I use to use Toluene in my STI... that hardens the rubber in the fuel lines.... yeah crazy stuff and that was my DD.. two gallons of toluene per fill up. We get crappy 90 octane here in TnT

 

Toluene by its self will dry out rubber, but most gas has lubricants in it that will make up for this assuming its a mostly gas mixture.

Toluene fine for in tank use, same with denatured alch of, Xylene etc.. lots of good "octane boosters" out there.

From my DSMlink logs Torco is the best I've found.