^I suppose it's been about finding a MTF that is still "correct" as regards it's viscosity but one that keeps the shifting smooth for a longer period of time. The knock on the Honda Genuine seems to be the friction modifiers wear out more quickly than perhaps others? We're talking within 5,000-7,500 miles. Not even half of the interval recommended in most manuals. Typically it's once every 15,000 or 30,000.
Someone else can correct me if I'm wrong. The use of motor oil, with different FM's, is only a temporary patch. I'd expect the Honda Genuine product to have FM's that can last the length, or close to it, of the service interval that the manual specs.
I heard, for instance, otherwise, that Amsoil's MTF has a little bit better cold weather performance(more like a 5w-30 oil) than the Honda Genuine. Which, was closer to a 10w-30/40, but now apparently is thinner(the Honda Genuine II MTF)?