I have a Bernina 1530 which is still going strong (from the 90s). I use to have my baby serviced yearly but I let it slide to about 18 to 24 months. This last check up was way overdue but difficult for me to get it in for servicing (don't drive being disable). I am not sewing as many hours I use to. DSM are a lot like cars. How far would you stretch an oil change if you weren't driving as often?