Hi Guys, I just bought a 2001 KDX220. It was a good deal, but needed some work. So I had the top end rebuilt with a wiseco piston, had the power valve cleaned, put some new plastic, handle bars and hand guards, new chain, and new tires to come. I had this all done at a local shop. They changed the tranny oil, but I think they forgot to put new stuff in as I noticed there is a little "eye" on the side of the case and I couldn't see any oil in there. Luckily there is snow here, so I haven't ridden it yet. What type of oil should I use? Thanks.