Welcome to the Quilting Board!
Whale oil and 3 in 1 are the hardest oils on sewing machines, and they used to use whale oil exclusively in the sew repair shops.
Muv has some very nice videos about cleaning the vintage machines How to Clean Up and use a vintage sewing machine - videos by Muv and Fav grab some tea and enjoy!!!
NEVER let a sewing machine know you are in a hurry.
Find me at Victorian sweatshop discussion group