Servicing frequency depends on how you’re using the sewing machine, and how often.. Moderate or heavy-use machines can often be self-maintained by oiling as needed and providing basic TLC. Heavy-use machines can require more frequent servicing, but likely not more than a couple times a year, or in the event of obvious problems. If your machine has been stored away for a long time, a service can clean out dust and dirt as well as random elements that can settle in and create problems. This might require some disassembling on your part. If your machine is struggling and you are not handy in the DIY world, take it to a professional.