Last spring I purchase a 600 and 800 Etec tnts. Now I don't want to start an oil debate I just want to find out what oil did the sleds come with. the manual says either semi syn or full syn, but on both oil reserviors it says to use semi syn. I also purchased two starter kits which i didn't open until now. the kit comes with a belt, two plugs, a gallon of oil and some polish and rags. The problem again is the 600 kit comes with semi syn and the 800 kit full syn. I don't want to use two different oils so I will use with what ever came in them and standardize. Does anyone know, please help.