Be careful with using the recommended intervals on your bike. They state that their own chart doesn't include ATV's or Motorcycles. I defenitely over change the oil in my bike because I ride hard. I have a GSX-R 750 SHRAD with tons of modifications and I have a hard time staying on two wheels.

Also, even with synthetic oil, I wouldn't drive my VX more than 7,500 miles. Cleaner is better no matter what. Unfortunitely the VX motor isn't the most durable (I know because I'm on my second engine) so I will definetely over change the oil. Anything to save $5,000 as that's what a new engine costs.