I bought a used Bernina 630E machine and can't find any information about oiling it in the booklet. My old machine was a Sears and had to be cleaned and oiled frequently. Also I need information about where to oil it. If anyone can help me I'd sure appreciate it. Also, does it need to be cleaned and adjusted by a service person and how often. It seems to work fine but I don't want to ruin my machine. Thanks a bunch. I really enjoy reading the discussions on here. This is a very helpful site.