I want the best for my new 2016 grizzly, but I also do not like spending my hard earned money on an oil that is not necessary. I am going to stick with the yamalube during my initial break-in period, but am open for other options on oil types/brands. I have spent a few years on a web site named "bob is the oil guy", and have seen quite a few positive posts and used oil analysis reports on diesel rated oil with the JASO certification such as shell rotella. 15w40 for summer, and 5w40 for winter. I just wanted all of your opinions on this highly debatable matter. Please give feedback based on your personal results regarding clutch issues and or other experiences with your oil of choice. If I choose to stick with yamalube, im going to have to shop online for this expensive stuff. Thank you all.