You are correct, I rembered the moto gp engine change rule while i was at work today. The difference between riding a bike on the road and riding a race bike is ---- no matter how hard you push a bike on the road it is only for short periods of time and rarely at maximum rpms, whereas a race bike is often at maximum revs and there is no slowing back to the speed limit and cruising until you get to the next set of twisties. Gp bikes are flogged as hard as you can ride a bike and like i said before, are also cutting edge technology, so dropping the oil so often is a very small outlay for a race team to make sure there is no damage to the bike, which also means safety for the rider. I'm not sure what you meant when you said -- it is fancifull to think all bikes should have their oil changed at the same intervals. This seems obvious and is up to the individual owner.