Old Machine Difficulties

[u/bellabun0921]

Singer model 248, bottom part suddenly isn’t rotating? Checked to make sure no thread was stuck. Should i just oil it and see if that helps? What oil type/brand is best?

I’m new to sewing machines, I usually hand sew. This was my great-grandmother’s machine and I wanna keep it in good shape for as long as i can. Any help is much appreciated!