I ended up returning the Honda GN4 10w-30. The dealer told me that Honda has discontinued their 10w-40 in both the GN4 and the HP4 and will only produce 10w-30. Thought that was sorta strange, but in any case, I picked up Suzuki 10w-40 - all the same specs as the Honda GN4. The bike only has 1,600 miles on it, so I wanted to get at least one more, if not two dino oil changes in before switching to full synthetic. Took me a while to figure out the clips on the fairings, though. All set now - next change will be a breeze!