Quote:
Originally Posted by MadisonMPG
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)?
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...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).
...read the WIKI explanation for
octane, it should help you come to your own answer.