I like to use Marvel Miracle oil when not dealing with plastic parts. It's cheap, was made as a sewing machine oil when first introduced, and works very well, especially since my supply of sperm oil has been running low. I like tri-flow products too for the more modern machines. Up to the 500 series, the machines were nearly indestructible regardless of what was used. I restored a 401 where they used auto grease, cleaned it up, and it runs like a top. Now that was great engineering!!!