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Octane Grade for 03 Impreza WRX?

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Old Apr 15, 2004 | 05:24 PM
  #3  
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DrD
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Car Info: 2012 Legacy 2.5GT-L
you need 91 octane or better
Old Apr 15, 2004 | 10:54 PM
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Do not use anything lower than 91 octane.
Old Apr 17, 2004 | 07:36 PM
  #6  
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well, technically you can run on lower grades but you will get diminished performance and poor gas mileage
Old Apr 27, 2004 | 08:57 AM
  #7  
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There's always that user manual thingy you can read too

If you haven't looked at it yet I recommend it. It's probably in the glove compartment. Take it inside tonight and leaf through it.

Ok, so the plot sucks and the characterization is pretty bad so its not the best summer vacation novel but it's got lots of stuff you should know about your car

Last edited by gotwrx; Apr 27, 2004 at 09:05 AM.
Old Apr 27, 2004 | 09:13 AM
  #8  
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Originally posted by gotwrx
There's always that user manual thingy you can read too

If you haven't looked at it yet I recommend it. It's probably in the glove compartment. Take it inside tonight and leaf through it.

Ok, so the plot sucks and the characterization is pretty bad so its not the best summer vacation novel but it's got lots of stuff you should know about your car
lol ditto, you need to invest in some time and read that book.
Old Apr 27, 2004 | 10:41 AM
  #9  
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Originally posted by sonicsuby
well, technically you can run on lower grades but you will get diminished performance and poor gas mileage
No.... Technically it say use lower grade gas in ONLY an Emergency!

Lower grade gas will cause engine knock and detonation which WILL damage your engine so DONT do it!
Old Apr 27, 2004 | 10:50 AM
  #10  
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Car Info: Silver WRX wagon
Originally posted by RoadSpike
No.... Technically it say use lower grade gas in ONLY an Emergency!

Lower grade gas will cause engine knock and detonation which WILL damage your engine so DONT do it!
The ecu is supposed to adapt so it won't. That is assuming its stock.

But don't do it anyway. You bought a performance car to experience its performance. Premium gas is required for that.

Besides the oil companies need your money and the extra 30 cents a gallon really helps them out

Tim
Old Apr 27, 2004 | 11:26 AM
  #11  
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Originally posted by RoadSpike
No.... Technically it say use lower grade gas in ONLY an Emergency!

Lower grade gas will cause engine knock and detonation which WILL damage your engine so DONT do it!
see below...

Originally posted by gotwrx
The ecu is supposed to adapt so it won't. That is assuming its stock.
thank you.
Old May 1, 2004 | 05:46 PM
  #12  
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I only use 94 octane. It is worth the extra $ I get better performance & gas mileage.
Old May 2, 2004 | 08:34 PM
  #13  
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Car Info: Mazda Protege '02 (Wishing protege has AWD and a H6 twin turbo)
It would be if you had a ecu map to use the extra octane. Though from what i understand the ecu should adjust a lil in your favor with the higher octane.

If you used an accessport and had a 93 octane or so fuel map it would be usefull
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