Hello, I'm thinking about my next bike right now and I'm leaning toward an MX 450 to turn into a HS/Off Road bike. My current 530 EXC I have to change the oil every 15 to 20 hours and it's a struggle to make sure it doesn't burn too much of its .6 L on the engine side in that time. How long do you guys go between changes, how much oil does the KX hold, and is it a shared bath between the motor and the transmission? Also, how many hours might I get out of one of these before a rebuild? Is 120 hours possible?