New to the forum so I am stumbling around a bit. A question for you guys in the know, is it a good idea to use a full synthetic oil in my sump? I have a 2001 Foreman 500 Rubicon that I have had since it was new and two 2009 Recons. I have never used synthetic before in them until recently. A person told me that synthetic may not act right in the gear box. I thought synthetic was the best and greatest. Any thoughts out there?