i use extreme 100 all the time and find it works fine, even better than anything else
Your engine will run fine. It's just that the seals that Honda used before 2002 is not guaranteed to be ethanol compatible. Maybe Honda is just trying to play it safe by stating 2002 instead of older (I'm sure the 2001 and 2002 DC5R are identical). But hey, my car doesn't need 100 octane. It's not tuned for it.
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