How often do you change your oil

[midden]

Contrary to what Stevierst says, I think regular oil change is good for the wear of metal parts. As oil gets used, it collects deposits of carbon and metal shards. An excess of these in the oil will increase wear on the metal parts. That is not to say that Yamaha are wrong. 6000 miles is the recomended milage. Fair enough. But I would rather change my oil before that point than after. And every year if I did less milage as the oil degrades. But, its your bike and you can treat it any way you like. Shit, don't ever change it for all I care 

Off bike,  my cage is a skoda and it gives me a choice of 1yr or 2yr oil. surely metal shards can't discriminate between the two. 
I actually heard once that changing oil too frequently could do harm as well.  But that aside I'm inclined to follow the recommendations from the experts of both vehicle and oil producers allowing as with all sell/use by dates a safe extended period. After all they have more than one motorcycle to lose if they take the limits to close to the edge and also by giving a reduced life span they sell more product. So why give them more sales by further reducing it. Clearly if using standard road use spec oil and then thrashing the bollox out of the bike I would adjust to hopefully compensate. But then if I was that concerned I would read the label and buy for purpose.  [size=78%] [/size]