I just picked up a new (to me) Singer 201 sewing machine I had serviced by my Singer dealer. I was curious about the proper "grease" to use, so I asked the technician and he told me to use Tri-Flow. I found it on Amazon:
https://www.amazon.com/Tri-Flow-TF23004-Clear-Synthetic-Grease/dp/B000C15MUU/ref=sr_1_1?crid=2NFMIUM0G4KC8&keywords=clear+synth etic+grease&qid=1562029021&s=gateway&sprefix=clear +syn%2Caps%2C171&sr=8-1
-Bonnie