Same here with my EXR. I just did my 10 hour service, changed the 90cc of gear oil. Even though I knew how much gear oil the bike held, it still amazed me how little oil it actually is, especially when comparing to regular motorcycle oil changes. Went with Amsoil finest stuff rated for 100,000 miles. So it should be good for 100 hours. Also put a new Dirt Tricks Zirconium 52T sprocket on the rear, and a 12T up front. If my math serves me correctly, I gained about 6% of mechanical advantage to the rear wheel and lost 4MPH top speed. This should translate into having a couple of more miles of off road range for the type of riding I prefer and do. This may not sound like much of an increase, but it could be the potential difference in pushing my bike 2 miles to the truck, I will see what it translates into tomorrow for my real world comparison.