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Don't use synthetic on a new engine. Run dinosaur oil for the first few changes at least.
Oil change intervals are in the manual. I'd trust honda on that one. For the first change, however, I'd flush the oil more frequently than what is says, say, at 500 and 1500 miles if the manual says change at 3000. Most of the new-engine crap will dirty your oil at the beginning of break-in, so change the filter too.
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