I never oil any of my machines that say, "Do not oil". They do need lubricating, but done by the dealer when they are taken in for servicing. IMO, it's a good idea to have your machines cleaned/serviced regularly by a professional. That's one of the reasons I'm so glad I have a trustworthy dealer from whom I buy my machines and to whom I can take them for service and/or repair. The more expensive the machine, the higher the price tag, though, on having it serviced. My contribution to keeping my machines in working order is to keep them as lint- and dust-free as I can.