Gas Premium or regular?

[Ubersuber]

Originally Posted by Mikem53

Nobody buys gasoline to be used as a lubricant, that was not my point.. Uber-ass had to say something to look like an expert, I should have ignored it.
The fuel does indeed lubricate the fuel pump and other fuel system components.
Uber-ass suber once again has to try and impress everyone with his vast knowledge, which of course was similar to his suspension/bump stop ramblings which were all worthless bullshit, but amusing.
It's my fault for arguing with an idiot.. They will just knock you down to their level and beat you with experience.

Gasoline does not lubricate the fuel pump, rather the reverse, and certainly doesn't lubricate the injectors. This lack of lubrication quality caused serious engineering challenges to makers of fuel injection and fuel pressure systems. This is such common knowledge no expertise is required to understand it.

The username is spelled Ubersuber.

And you got the rest wrong in your post also.

Give up.

[Tcoat]

Well I tried.

[charged86]

e85

[Stevew8]

I had used nothing but the highest octane ever when available on

99 volvo S70 Turbo
2003 Passat W8
2011 Camry Se
2013 FR-S

If you own the car then why be cheap on it, the dirty gas eventually will haunt your dreams on the long run.

[wparsons]

Originally Posted by Synack

12.5:1 super high compression says premium only. Sure it will compensate if you put in 87, but when you take your car to the dealer when your engine blows and they find 87 in your fuel lines and gas tank they will leave you with the multi-thousand dollar bill.

Mazda sells 13.5:1 SkyActiv engines that run on 87 octane. C/R isn't the whole story.

Originally Posted by strat61caster

>Thread about octane ratings
>A dozen posts arguing about the lubricity of gasoline

Welcome to ft86club!

Welcome to any thread Suberman (Usersuber) posts in.

Originally Posted by Neokolzia

My question is in the winter would 87 be fine? Maybe with just a splash of octane booster, would save a fair amount of money, 1 tank free worth over a winter for sure.

Not worth it. The cost difference between 87 and 91 octane is like $4/tank, and running 87 octane would mean babying the car to avoid knock. If you want a car that runs on 87 octane, buy one that's designed for it.

[rs999]

You can run regular 87 if you want. If the car is stock nothing will happen, even if you race, autox, or run the car out.

The octane ratings don't mean anything for stock cars because the manufacturer has built in safeguards to protect the car from the appliance driving public.

The only time octane ratings matter is when you flash tune the car since most tuners don't account for lower octane levels and try to tune the car to get the most HP out of the octane. So lower octane ratings on tuned cars are more likely to experience the badness of knock and timing retarding.

[Ubersuber]

While true that modern engines are programmed not to damage themselves when filled with low octane fuel, performance is very poor with low octane.

Subaru states in the owner's manual that the engine is intended to run on 93 (98 RON) so using 91 is already using low octane fuel for this engine.

[rs999]

Originally Posted by Ubersuber

While true that modern engines are programmed not to damage themselves when filled with low octane fuel, performance is very poor with low octane.

Subaru states in the owner's manual that the engine is intended to run on 93 (98 RON) so using 91 is already using low octane fuel for this engine.

Yes but on a stock 86 nothing will be damaged if you run lower octane even if you race, autox, or drive aggressively.

Also, the lower performance is very subjective, 99% of the drivers (both forum and regulars) wouldn't know the difference if the car was filled with 87 vs 91/93.

As I stated above you only feel and require higher octane once you are tuned, otherwise it really is optional.

[wparsons]

Originally Posted by rs999

As I stated above you only feel and require higher octane once you are tuned, otherwise it really is optional.

Even with an aggressive tune the stock ECU will still respond to knock the same way it does on the stock tune, which is to pull all kinds of timing.

If you're boosted, the consequences are much higher and you're likely to damage something, but N/A it's not going to explode.

[Neokolzia]

93 is scarcely available in Canada we only get 91 so they can't really force it

[Apoc]

Originally Posted by Neokolzia

93 is scarcely available in Canada we only get 91 so they can't really force it

I've never had an issue finding 94 oct in western Canada.

[Tcoat]

Would have to take out a second mortgage to buy 94 in Ontario! Plus burn a 1/2 tank driving to the few places that have it.

[CoupedUpSubie]

I wish people would read the manual. 93 is preferred while 91 is minimum. If an automanufacturer wants to sell volume in the US then selling a car that requires 93 is almost shooting themselves in the foot.

When poor or low octane fuel is used it can creates knock, the knock sensor then relays that to the ECM which retards the timing. As stated the stock tune is conservative, for 91/93 octane. If you run 87 octane you do risk damaging your engine, even on a stock tune. Most people who have had the dealer put 87 in the car get away with it because they drive easy for the break in period.

When it comes to engines using fuel which meets the specifications given by the manufacturer is key. In the shipping industry vessels carry fuel samples for 2 years. One reason is if bad fuel is the cause for mechanical failure. I'm not saying we all have to keep samples of the fuel we put in the car, just making a point.

Don't be cheap, put at least 91 octane in the car. You bought a "sports" car.

[wparsons]

Originally Posted by Tcoat

Would have to take out a second mortgage to buy 94 in Ontario! Plus burn a 1/2 tank driving to the few places that have it.

You're kidding right? I have 4 stations within 2km's of home that have 93 or 94 octane. Three petros and one esso. Both are only 2-3 cents more per liter than 91 octane at the same station.

Before you claim London has fewer stations with 94, this is all the petro stations in the London area that have 94.

http://www.petro-canada.ca/en/locati...PC=+&R=50&B=UL