Wrong oil.. Needs to be oil specifically for wet clutch.. Sounds like you need to check the wet clutch shoes. Probably toast.
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2013 550 Core, AC Hand Guards, Maxxis Zilla 27x9x12, 27x11x12, RTR Steer Light & Shock Bushings, Auto Resetting Brkrs, Front & Rear Brush/Bumpers, RAM X Mount & Cup Holder, Champion 3000lbs Winch, AmSteel 3500lbs. Syn Rope, Braided Hook Strap, Rowe Offroad Anodized Billet Alum Hawse Fairlead, Bostitch 28" wtrproof box, Reese Tow Hook, DYI Web Catchers, Koplin Overfenders, SpeedWerx Clutch Kit, DDM HID 35w 8K Kit, CREE LED light bar & Green LED Low Beams.