Not sure if these are the same design or not but they are Paolis.
The manual for the 2004 600 has a good section on the Paolis
http://www.adboivin.com/Afficher.asp...=497&langue=en
You can get around the special tool needed if you have an impact and 14mm allen head socket. (if they are the same)
Recommended oil weight is 15, but these are heavier machines and are used in the cold!