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Old 03-16-2010, 11:20 PM   #8 (permalink)
gone-ot walking...
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Originally Posted by MadisonMPG View Post
I am not advocating using higher octane. I am asking: Does using higher then approved octane (Premium) shorten the life of an OBDII engine meant to run on 87 (Regular)?
...two letter answer: no.

...octane is a "knock-limiting" value and basically nothing else! So, using 91 octane ("Premium") in a car designed for 87 octane ("regular") will NOT damage it whatsoever.

...what can damage an engine, however, is using different fuels containing god-knows-what-kind of additives that don't burn cleanly.

...this has NOTHING to due with octane--but is, too often, one (of many) false claims made for the additives--but rather the "left-over deposits" from faulty combustion, which CAN by themselves cause "glowing carbon" deposits which CAN result in pre-ignition and cause damage (if the computer can't yank the timing back quick enough). the WIKI explanation for octane, it should help you come to your own answer.

Last edited by gone-ot; 03-16-2010 at 11:50 PM..
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