I probably change my oil every 500-700 miles... Could be just me but I feel a difference around that point... I check it in the same spot with the engine warm... Warm is specified in the manual. I was always told too much oil is worse than too little, and oil like most things expands when heated... Random note, KTM's are odd compared to what I'm used to. The 625 I had, had two oil windows. One for checking level and one for making sure it had flow on the other side. The one for checkin the level had an upper and lower mark, the lower was for checking it cold and upper for hot.... Never saw that much movement so I kept it in the middle... They put the kick starter on the wrong side of the bike... I will never understand that....