We took our HCH2 in to the dealer (Bay Ridge in Brooklyn) on Wednesday for its first oil change, and they put in 5W20 without telling us. I called the service manager and when he got back to me, he said that there's a shortage of 0W20 from Honda and he doesn't know how long it will take. (He did apologize that no one asked us if the substitution is okay.)

Honda does say you can use 5W20, and it's still warm enough here that I'm not in a panic, but as soon as they've got the 0W20 in, I'll get it changed.

Would-be hypermiler