So, my front diff started weaping out the shaft seal back in May. It hasn’t been bad, so I have been monitoring it. Last weekend we were riding on Sunday and the wet weather we have been having promised lots of mud, so I decided to change my diff fluid just to keep it clean. I had some Yamalube friction modified shaft gear oil left over from my 450, so I used that to change both the front and back. Strange as it may sound, not a drop has leaked out since I did the change. I also checked the vent tube to make sure it wasn’t obstructed. I ran my finger around the shaft last night and not a spec of oil after 35 miles of heavily utilizing 4wd…not a trace! I had synthetic in it before from the dealer, so I am wondering if it was just too thin or maybe Yamalube has a better additive package. Anyway, I thought I would share my findings.