Look at the magnificent teal and green machine my friend brought me. My mom had one as a young mother. It was later stolen from my apartment when i was 24. Ive been looking for another ever since.
Its clean as a whistle but i did oil it with triflo. After oiling one is meant to ” put a brick on it” meaning push the foot control and run continuously untill the sound changes. Hopefully the sound changes from rough to smooth. In this case it did and now it is nearly silent.