I just took mine apart and cleaned it. It's a wonder it would even run with all the lint in there!
When I took my machine in for a sewing lesson she used a spray can of air to clean inside my machine. I may have to invest in one of those cans.
I was told that machines with a drop in bobbin never need to be oiled. Doesn't seem right to me but the book that came with it doesn't say anything about oil in the maintenance section.