I took a self maintenance workshop for machines and this is a few things I learned. Oil made for sewing machines is made to evaporate. Machines will clog up with oil if it didn't. Most machines that say no oil is needed have silicone gears impregnated with oil so as the machine is sewing it it self lubricating If you leave self lubricating machine in the closet for years, the gears could crack before becoming lubricated again. . I know the older Janome Jem machines are self lubricating. . All side loaded bobbins need cleaning and oil frequently. It's okay to use can air if the housing is off your machine, never use to blow into the machine. I piece and machine quilt on a Juki TL 2010. The housing is easy to take off and I can see and clean every moving part. A panel that opens on the bottom is a big help too.