What is the Mobil 1 filter #?
Good filters?
I personally don't know, but from what I've read, they seem to get really favorable reviews and many people use them. Just by looking at it, I would say it's better than the OEM filter and Mobil 1 generally makes high quality stuff. As long as it works, that's good enough for me. I will use them for the simple fact that I can get them at Autozone a half a mile from my house, whereas the Yamaha dealership is 30 minutes across town.
I use pure one oil filters, they are about as good (according to reviews) and 1/2 the price of mobil one filters.