What does Honda recommend in the owners or via its dealers? My 1999 Civic used 5W30 when new; a few years ago I was at a Honda dealer and saw a Honda chart calling for 5W20 for current model Honda Civics and going back to 1999 and maybe earlier: a retroactive change in recommended oil.
I doubt that 20W50 has been recommended by Honda, or a 3200km change interval, either. Who suggested that?