I have had a few comments on my blog about treating sewing thread with mineral oil. Here are some more details:
Before machine quilting, I immersed my thread in mineral oil. I then dried off the spool with a paper towel so there would be no dripping or splashing. I have not had any problems with my machine or the fabric. I have only done this while machine quilting with my Juki sewing machine. My Juki is a basic single stitch machine, which calls for oiling every day with frequent use. I don't feel that the mineral oil will harm my machine.
I would certainly consult your owner's manual for your sewing machine. A lot of computerized sewing machines do not call for oiling (except for routine maintenance by a mechanic).
I would like to know exactly what kind of oil "sewing machine oil" is. I have been doing some research on this and the information I've found is very vague. I did find one site that states sewing machine oil is a "light" detergent-free mineral oil. I would love to find a sewing machine mechanic to get his/her opinion, and all input is welcome.