[Ecky]

0w should be safe in any engine, or at least any semi-modern Honda engine. It will behave like a 30 weight when warm, and like a 0 weight when cold, which is a good thing. You don't need to wait for the oil to get warm to thin out and start lubricating properly.

EDIT: I mostly went with Green Oil because it's thinner when cold than a 0w16. A 0w16 would be thinner when warm, and thicker (than Green Oil) when cold.