I have a question about oiling your machine. My MIL got me a basket full of quilt goodies and she gave me oil. As I am a beginner I don't know where exactly or how to keep mine oiled. How often should you do it and what parts get it? I have a Brother CE4000. It is computerized. I searched the manual and don't see anything to be helpful in this area. :( Any tips would be great, I want to make sure it stays working smoothly!