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Does it really matter if you use a higher octane in a wrx than is recommended. I know not to use lower or the engine may start knocking!

2007-08-02 09:43:43 · 9 answers · asked by Ryan B 2 in Cars & Transportation Car Makes Subaru

9 answers

It will not help you, and may actually reduce your gas mileage.

If you have the money to throw away, feel free.


BTW, if you really want to throw away money, I have a good trash can here!!!

2007-08-02 09:49:33 · answer #1 · answered by fire4511 7 · 2 0

I recommend foll wing your owner's manual. Your performance wont be any better running a higher fuel than recommended unless you have a whole lot of aftermarket performance stuff that requires it.

I know Subaru did some real life driving on US highways with their turbos and 6 cylinders a couple of years driving different octane levels. That is partially why you will see the newer 6 cylinder Subaru's no longer require 89 octane although it is still recommended.

Good Luck and Good Driving!
scottm@thewisetuner.com

2007-08-04 12:23:20 · answer #2 · answered by thewisetuner 2 · 1 0

The performance will not get better with the higher octane. You can burn the $ if you wish. BUT.....Once you make up your mind, do not go back and forth between octanes as that messes up the engine as it has sensors that slightly adjust for octane variation. Too much swing will reduce mileage as the engine will not adjust.

2007-08-04 15:47:29 · answer #3 · answered by Deadhead Neil 3 · 0 0

If your car is a Japanese IMPORT.... then yes its best to run it on the highest octane fuel you can! as the cars a built and mapped to run the higher octane! if you bought it as NON import then it will most likely be built to run on your country's octane limits.... Yes running a car on less octane than its built for will eventually have effect and you will notice the car will not perform anywhere near what it should!

Hope this has helped.

2007-08-05 07:43:27 · answer #4 · answered by Escort_Turbo 2 · 0 1

Follow the manual, the engine is made for the recommended octane level. Anything higher will just burn faster.

2007-08-02 21:41:37 · answer #5 · answered by ? 7 · 0 2

no it doesnt, you wont notice a thing and its not good for your engine in the long run, now if u were runin crazy aftermarket part thats when u got to think about race fuel and stuff

2007-08-03 12:39:32 · answer #6 · answered by Tin 2 · 0 1

No, go ahead, it's a waste of money though.

2007-08-05 13:34:56 · answer #7 · answered by Erst mit hund 1 · 0 0

No it will have little effect except on your wallet

2007-08-03 13:49:21 · answer #8 · answered by mick 6 · 1 1

it wont hurt anything except your wallet...

2007-08-02 16:57:16 · answer #9 · answered by grasshoppah 4 · 2 1

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