High RPM's, the fact that the bike uses a 'wet clutch' which means there is motor oil all around the clutch, transmission too. When you change the oil you are flushing the clutch and the tranny fluid as well. Plus oil is cheap and keeping your bike in tip top shape is important. Fram oil filters from wallyworld are 5 bucks for the 500R. Its great being able to buy all my stuff there.jetedawg said:what makes a bike so different than a car to need it so much sooner? the high rpms that the bike sees constantly? remember i was a car guy, just gettin into bikes. sorry if this is a retarded question.