Now that I have read all the threads about what oil to run, I would run amsoil15w50 racing oil. Yes Bob Teague does run his skater with amsoil and after Mercury did a refresh on his engines they said they have have never seen an engine so clean. There was no discoloration on the cam or the rollers. The crack looked there wos no major wear at all. Do I beleive it ? Yes I do when it comes from Mercury Racing Division. I just like Teague use asmoil in my Dodge Durango and have other people switch over to it as well. And amsoil has a bettter oil for drives as well. And I am also an AMSOIL dealer as well. Zone 5 is living proof that amsiol is a product you can live by. Pm me if you want to know more about amsiol products.