Sewing machine oils?
A couple years ago, I purchase a Qt. of commercial sewing machine oil for my commercial sewing machine. It is clear color. Yesterday, I was wanting to oil my featherweight and got my Bernina sewing machine oil out that is about 5 years old and it's dark color and feels much heavier. Does oil go bad? Why would my commercial oil be clearer and feels like lighter weight oil? I don't want to ruin my featherweight machine and need to know more about sewing machine oil. Also, is it OK to use Lubriplate on the featherweight gears?