They are Kawa 23 I think. Yes I use all the same oil etc. This mower has the most hours on it at 1300. I have yet to replace anything with it as I have replaced a starter, battery etc on the others but when battery tester on it, it shows good yet?? Maybe after all machines are cleaned for the winter (which were working on now) I may just throw a new battery in it and see what happens. If not battery I can always have an extra on the shelve.