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Question by G-train
Submitted on 6/30/2003
Related FAQ: Gasoline FAQ - Part 4 of 4
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What are the emissions from various octanes?
Does using the wrong octane affect emissions?
What emissions are produced from the wrong octane?
Does using the wrong octane cause incomplete combustion?
What other effects are resultant from wrong octane?
Does the production of various octanes result in disproportionate refinery emissions?

Answer by Abouelrooh
Submitted on 9/15/2003
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It's according to the composition and the additives in it


Answer by JGMagoo
Submitted on 1/19/2005
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If you use a gasoline with too low an octane for your engine and altitude combination you will get knocking or "pinging". (This produces a sound that sounds a lot like dropping pebbles into an empty glass milk bottle - kind of a rattle.) If your engine is knocking or pinging two things happen. (1) The engine will sooner or later become severely damaged, and (2) the knocking or pinging will produce greatly increased oxides of nitrogen due to the greatly increased pressures and temperatures created during the knocking and pinging event. These oxides of nitrogen are definitely harmful emissions. So yes, the wrong octane CAN increase emissions. By using more octane than is necessary, you are really only wasting money by buying more than your engine needs.  


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