not sure, just got the monster 2 weeks ago. It was low on oil a machanic told me to worm up the bike then check it,but he didnt say if i should put the oil in just after checking it. Well i did and when its worm the oil level is normal but for sure when its cold its hi and he told me to 20-50 instead of 20-40 which wasnt readlly available what do you think.