Quilt Fan,
I see you don't get to the Vintage Sewing Machine section much. We have many threads here discussing Tri-Flow oil and grease.
It is a very high quality product that really does much more than regular sewing machine oil. Your machine is probably gummed up in the back and forth ZZ parts. Tri-Flow has solvents as well as lubricants that will get into these places and free up stuck parts.
You can get Tri-Flow oil and grease at Sew-Classic {
http://www.shop.sew-classic.com/ }, and usually bicycle shops has the oil.
Joe