Definitely stick with something like Triflow or the Singer products. Believe me, I'm the queen of "if it works, use it," but having seen what old 3-in-1 oil and gummy black grease look like in old sewing machines, I wouldn't use it. I haven't used Triflow, but that's what I'm going to try when my giant bottle of Singer oil runs out.
Been working on that bottle for years!