When asking around, I get varying opinions on oil consumption, some say their bikes use none others say they do - Had 2 new Softails, both used some, - couple of my buddies have 06 Softail Std (16000kms) and 08 Dyna Lowrider (13000kms) both claim dont use any - My old Softy would go for a while use nothing then all of a sudden take a drop - whats considered normal usage?