I can honestly say that now I know how to change the oil in a 4 stroke Yamaha boat motor!!!! GO ME!! GO ME!! GO ME!! Just like everything else in my house (guns included) I know how to take it apart, clean it, put it back together, and use it!!! Look out guys!! Not only did I cange the oil in the boat motor, but I had supper ready by the time WE were done. :D Hell, next time I may do it by myself!!