[Water Warrior 2]

I think it relates to engine oil capacity. That is also a good point though. The smaller the oil capacity the sooner the oil may break down due to shear forces of the gears. That said, is the GZ a strong enough bike to break down oil in a short time? Probably not unless you abuse it. I think Suzuki figured out the capacity a long time ago and it seems to work. Regular service is all any bike needs unless it is ridden really hard or in extreme conditions. I may change oil early if I anticipate a trip with either bike or cage but if it will be a bit overdue at the end of the trip I don't get excited about it. Modern oils will last far longer than most owner manuals lead us to believe.