I use the Pensoil Synthetic oil with no problems. I hear a lot of talk on the web about this oil and that oil. I believe most Synthetic oils are great for ski. Some people swear by factory oil or Amsoil which is excellent but a bit deep in the pocket. I would make sure to get the Total 100% Synthetic oil. I have been running the pensoil in my seadoo boat with a 717 motor for years. It runs great. I run the same oil in my yamaha xl1200 ski and it runs great. If you have a fuel injected model I highly recommend Synthetic oil only.