hey i changed the oil at 420 miles the dealer and owners manual say 600 and it runs great i used the kawasaki 4 cycle motorcycle oil recomended by kawasaki and the oem oil filter but if u want the best use k&n oil filter they have them available now and i will be using tht next oil change ..... and if u dnt wanna void warrenty make sure u keep ur reciept for the oil and filter and log it in ur maint book in the back of ur book as u probly already know ,,, just making sure Peace