Wow I just read all 41 pages. The independent shop where I got my oil from recommended Yamalube. I've been dealing with him for 15 yrs and I know he's looking out for my best interest. There were jugs of synthetics for twice the price that he could've recommended to make more money, but he said that the Yamalube will do just fine. The sled runs fine. The PV's were a mess, but I just got the sled in February and I only put 300 miles on it. The sled had some blue oil in it when I got, I have no idea what it was. I've run different oils in my sleds over the years and have had no issues with any of them. As long as you use an oil that meets the needs of your use you should be fine.