I have an older computerized Kenmore and I do my own oiling as I do on all my machines. I just get my manual and read the instructions for oiling, it has not been in for service since the late nineties. I oil it once or twice a rear depending on when it needs it. This is also true for my singer which is only about six years old and had to have it in for a new pc board but it didn't need oiling or cleaning, I do that whenever I see it is getting a little lint in it and if there is a lot of lint I do a more deep cleaning and take the bobbin case apart. My new Janome does not need oiling at all per the instructions.