I have 3 rides in ,118 miles on the 13 800 pro. 5.5 gallons of gas per ride, The oil is just below half way down to the fill line , is that where it is suppose to be ? Also i get a clunk 2 or 3 times a ride when i come to a stop then go to take off when i first hit the gas , its like the same clunk when you put it in reverse and forward. Anybody else notice that?