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Old 08-15-2008, 04:26 PM
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2.5 owners. What octane gas do you use?

the manual says to use 87 octane. i heard it's proper to use whatever's recommended but is it bad to use 89, 91 or 94 octane?
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Old 08-15-2008, 04:26 PM
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87 @ shell or chevron
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Old 08-15-2008, 04:28 PM
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It isn't bad to use higher octane with the QR, just not necessary.
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Old 08-15-2008, 04:29 PM
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The 2.5 is tuned for 87, 89 is a waste of money and 91 or higher you should only need if you have lots of bolt ons and have had the car tuned for 91 or higher to get the most out of the tune. Also the stillen qr-pro requires the use of 91 octane. But just I/H/E 87 octane is just fine.
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Old 08-15-2008, 04:44 PM
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truth, thanks for the tip guys
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Old 08-15-2008, 11:19 PM
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87 octane. the others are a waste of money.
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Old 08-15-2008, 11:22 PM
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Quote:
Originally Posted by Griffin View Post
87 @ shell or chevron
Same, and agreed with everyones comments so far.
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Old 08-16-2008, 12:13 AM
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Would you loose performance by using higher octane on a 2.5 without the qr-pro???
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Old 08-16-2008, 12:56 AM
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nismo recommends 89 octane after cams installed

from experience: tank of 87, no noticeable power; tank of 89, power is definitely present.
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Old 08-16-2008, 02:55 AM
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Quote:
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nismo recommends 89 octane after cams installed

from experience: tank of 87, no noticeable power; tank of 89, power is definitely present.
ive got no performance mods, just a short shirter and a berk WAI. all my mods are sound system related. im guessin i should just stick to the 87. i filled 89 and i thought i was noticing more power but maybe i was just imagining it
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Old 08-16-2008, 04:56 AM
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89 octane here, all stock tho. 10% Ethanol is a lot cheaper in a corn state , I save 10-15 cents per gallon this way, plus I live about 5 minutes from my work which I do full time for 3 days a week , I fill up about once a month
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Old 08-16-2008, 10:58 AM
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I fill up at Costco and I think it's 89 octane with 10% ethanol as well....I fill up once a month as well!
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Old 08-17-2008, 01:18 AM
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It doesn't matter. The higher octane you use, the cleaner it burns thus resulting in better combustion aka minor power gains. Using a higher octane also keeps a lot of the sensors cleaner as well as the cat.

Just dont go pouring C-16 into your tank. Bad things happen to dumb people when that occurs.
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Old 08-17-2008, 06:27 PM
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93 Shell here. It gets HOT here in Texas and my car is always running all day everyday on the many freeways we have here. I switched from 87 and noticed a difference. The engine runs smoother and has more get up from take-off.
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Old 08-18-2008, 03:14 PM
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Actually the manual IIRC states 87 at the least, it doesn't say you should get 87 exactly. 89 is still not a waste of money since it's cheaper than 87. Premium is the only gas grade that's a waste.
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