Re: How much oil does our scoot hold?
From testimonials I've read/heard, I'm a fan of Mobil 1. I use it in my car and change it out every 5K. As a general rule, synthetics take a lot longer to break down. One study I read mentioned that synthetic oil, regularly topped up as needed (in a healthy engine) should be good for around 15K+ miles. That seems high to me, but the message is pretty clear. Mobil 1 filters (along with Amsoil and a couple of others) have been tested to have the greatest filtration capabilities (even considering extended time: one study recommended changing the oil ever 5K or so, but only changing the filter ever 10K or so). If anyone wants figures, I can probably find them somewhere. Yes, Mobil 1 filters are more expensive than just about any other brand, but in the end, you may be getting what you pay for. It costs me about $35 to use mobil 1 in the car per change. That's about what you'll pay for a change in teh shop and I feel safe in squeezing in a few thousand extra miles out of it. In the end, doing it myself, I can actually save money (over going to a shop) using what I feel is a far superior product over time.
I haven't read nearly as much about the longevity of synthetics in bikes, but I would assume that the same basic principles are at work in any engine.