I'm working on the New Year's Day mystery quilt and my machine has developed a squeak. I can't tell whether it is in the upper or lower part, and it is more pronounced at low speeds (it does keep time with the needle movement). I have a Janome 6600 and the instruction book tells how to clean it, but nothing about oil. Keeping in mind Karla's oil adventure, I'm reluctant to just go ahead and add oil. Has anyone ever oiled this machine? Where did you add oil? I've cleaned like crazy, but that didn't eliminate the squeak, just lint.