It
can't hurt your engine if you
use a higher octane fuel. So, for example, if you
use 95 or 98 in an engine designed for
91, that's OK. However, it's not acceptable to
put in a lower octane fuel than the minimum recommended by the manufacturer.
Using 91 in an engine designed for
95 or 98 is potentially destructive.Dec 15, 2015
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