I was afraid of mine when I first got it but not so much now. Mine is really old and all metal. It has the oil holes marked, but I use the same guidelines as a vintage sewing machine. I oil everywhere metal moves on metal, run it a bit and wipe off any extra on parts that will come in contact with thread or fabric. They need to be cleaned a LOT, they make more lint and fuzz than any 10 sewing machines.
Cari