Gonzatrx450

hi guy, i am from Argentina, i have trx 450 2009, standar, y change oil everey 10hs, I'm using Motul 300v 40w 10 synthetic for motor and, transoil for transmision. at each change, also change the oil filter and motor oil during 10 hours of use out almost the same color as when I started. currently has 60HS engine use, and opened it to change the piston kit and found all very new, was to walk without touching 60HS, security and curiosity but decided to do so.