I can't say specifically about your machine although I do know that about that time some machines were made with "sintered bearings". Those were made with microscopic pores which were then impregnated with oil, so that it was a LONG time until they needed oil. I suppose that we were supposed to have the machines serviced long before this happened. This might be the case with yours.
Originally Posted by
RugosaB
Does anyone know why my machine (I have an old mechanical Viking 630) specifically says NO OIL? What is different the way it is built from machines that require oiling? I have had it since '88 or so, and compared to a lot, it gets used heavily, and has never been oiled.