I do not currently own a 4 stroke outboard, but have many other engines. I am an independent Amsoil dealer. All of their products are great. I use them in my Gatortail, vehicles, ZTR, etc. If you have any questions, please feel free to contact me. If anyone on this site is interested in trying any Amsoil products (motor oil, 2 stroke oil, gear lube, etc.), I can offer a discount. I will be placing an order soon and should be able to offer free shipping too!
https://aaoilco.myamsoil.com