The classic here are WD-40, those who use it and those who don't, much the same for 3-in-1, and there are a few recommendations for transmission oil, gear oil for cars, Marvel Mystery oil,... You will encounter people who swear by it, and those who swear they wouldn't come near either of them. There is something for the basic pure oil, 10 years later it will leave little to no residue in the machine, some oils have left a thick layer of gummed up varnish. I guess that's what we try to avoid. The basic Singer oil have done well for the better part of a century. I'll happily try a can of the supertech oil, I always need something for my bike and around the house too and I tend to use what I have.
There are something to the teflon added oils, at least Finish Line Ceramic and Triflow, my 201 and 99 runs a notch smoother on them. If it's worth the money is arguable, but I tend to keep a bottle of either for various purposes.
Last edited by Mickey2; 12-21-2018 at 09:24 AM.