I own about 15 machines. Only 2 are computerized. For those, I take them in every 2-3 years for service. I don't sew on them that often and since they are Vikings, I don't oil them. For all the other machines, I oil, grease, and repair all of them. I like using the older machines the best..... just love the gentle click click of the motors or feel the smooth workings of the hand cranks and treadles.