Mine is noisier than my Berninas. Sometimes, it almost seems to clank, but then I listen carefully to the Youtube videos of people demonstrating both the sit-downs & stand-up long-arms (all brands) and don't worry. Once you start looking for this, you'll see what I mean. Some people are better at masking sound with their video techniques.
Sometimes, I think it depends on how tight the top thread tension is, but this could be my imagination. It also seems to depend on how fast we go. The noise almost seems to go away the faster we go.
A drop of oil every other bobbin, or sometimes every bobbin, is all it should need.