There was a significant change here in 2006 with the Honda MTF. It is about a 10w-30, with SL levels of ZDDP (1400) and lots (3000 ppm) of calcium. So, similar to a motor oil but with a different additive pack. If you google Honda MTF VOA or Honda MTF UOA you'll find what you're looking for.
Here, the oil is about 4 dollars a quart from the dealer. Considering that's 1/2 to 1/3 what Amsoil or Redline is, it's a very good MTF for the price. Most Honda's take 2 quarts, so I guess price isn't a huge factor.