Oil change before 15,000kms?

[Phil the shearer]

Even the best oil will be absolute filth after 15,000km. The way I check oil life on track bike and road bike is if it's Black as the ace of spades it's been in too long. If it comes out with some colour left in it I think it is good timing. They use flushing agent to avoid sludging at the dealers.

But most bikes have a wet clutch system,not all but most. The clutch releases lots of contaminants into the engine oil system as it wears so oil life is much less with bikes,not really a good comparison with an automobile engine.
I'm going to go with 7,500km oil and filter changes on my vf as I intend to keep it for the rest of my days.
I just reckon 15 k is too long