Just bought 02 gsx R600, my first rocket but been riding all my life. The last couple days I've noticed it clunking harder and harder into 2nd and 3rd. On the fill tank it says sae (pp). I had no idea what that was so I looked into it and it says it's hydrolic fluid in one website and a type of gear oil in another site and I'm pretty sure I've always used just a thicker regular oil like 50w. The fluid is deff low, it's below the fill line also I noticed it's like a blue or dark green color so WTF is it and what should I use.