If you really think about it,a qrt of oil for both tranny and motor is nothing.Especially smoking up a track,which I do not do any more. I always run 34 ounces with or without filter change. I drop the oil every 2 rides about 3 hrs. Since oil is constantly being circulated through Yamaha's design and it has a tank,I wonder how much added oil can the system take without having the crank being flooded with oil? Will more oil cause more pressure than the seals can withstand? How bout drag on the crank with more oil? After the motor is stopped the oil drains out of the tank so the tank will not be overfilled.I love maintaining my bikes as much as riding them,infact I get warm and fuzzy inside after a filter and oil change.