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Old 12-06-2005, 01:12 AM   #1 (permalink)
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Hi, im just wondering what octane gas I should use. In the owners manual is says to use 87, but to my knowledge isn't 91 always better. 91 octane is supposed to be for, correct me if im wrong higher compression motors. So does the V6 mazda 6S motor need 91 or is it just a waste?

I also know if the motor is supposed to use 91 and you use 87 it will throw on the "check engine" light, because the emissions sensor will read incorrectly if 87 is used. I'm currently using 91, but I really dont want to waste money if its not going to really matter.

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Old 12-06-2005, 01:15 AM   #2 (permalink)
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Use 87. 91 is just going to be a waste of money.
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Old 12-06-2005, 01:17 AM   #3 (permalink)
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87. Only 87. Never 91. Premium is most definently not "always better". You're doing more than just wasting money -- Burning a higher grade fuel than your car is tuned to run actually hurts the engine (actually the exhaust system), decreases your fuel economy, and costs you power.
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Old 12-06-2005, 01:18 AM   #4 (permalink)
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Anything more than 87 is money out of your pocket.
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Old 12-06-2005, 08:37 AM   #5 (permalink)
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As stated above use 87 ONLY. A friend of mine who is a service tech for GM told me that you should always use what the owner's manual recommends when it comes to what the octane is. It can hurt your engine if you put any other in it.
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Old 12-06-2005, 10:11 AM   #6 (permalink)
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87 Mazda 6i, 6s.
93+ Mazdaspeed 6
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Old 12-06-2005, 10:15 AM   #7 (permalink)
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http://www.usatoday.com/money/autos/2003-0...remiumgas_x.htm

http://www.caranddriver.com/article.asp?se...article_id=3604
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Old 12-06-2005, 10:16 AM   #8 (permalink)
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trust me 93 means you pay more per tank of gas. If you aren't after marketly tuned, Spraying n2o, Or Speed badged from the factory you are paying for nothing but heartache. Damn shell and their (watered down) V-power is better adds!
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Old 12-06-2005, 11:57 AM   #9 (permalink)
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87 it is, thanks guys!
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Old 12-06-2005, 01:32 PM   #10 (permalink)
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but i always use the medium one.......does it matter?
or does it hurt the engine or anything?
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