10w-40 or 15w-40 Aug 6, 2018 11:41:51 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by crawford on Aug 6, 2018 11:41:51 GMT -5 My self 10-40 am-soil have 3 trikes last 3 7500 other 10000 miles never had a valve adjustment uses no oil between oil change 1,800 mile changes.