dnrtheil, here is a link to read all about Amsoil: http://www.performanceoiltechnology.com/snowmobiles.htm
Reason you do not see them available in the public eye, is they work through certified dealers/distributors. It is slowly leaking out to such places like Fleet Farm, only because they stand behind the product too. Reason being they want feed back to better perfect the product unlike most manufactures thet just want to sell, sell, sell.
Amsoil is good. I get mine at Fleet Farm. Ran out last week and all I had on hand was Artic Blue Synthetic injector oil. Seemed to smoke less and not much of a noticeable difference. Cheap too. Anybody else run that?
Oh yeah and my opinion on factory reccomended oils is to just go "aftermarket" synthetic. Sure you can't go wrong with factory stuff but you usually just pay for the name.
Ive been using the Bombardier mineral 2 stroke injector oil, can pick a 4l bottle up from the local walmart for $19.97 or something like that. In my previous sleds that required to be mixed, i usually went with Castrol 2 stoke oil. Have never used anything but those. Have been thinking of switching to Klotz, but not sure if theres a distributor nearby.