My Berninas (yes...plural!
) get de-fluffed and a single drop of oil on the bobbin race with every bobbin change.
My serger (also a Bernina) gets vacuumed and oiled every time I use it.
My Handi-Quilter is just like the Berninas and gets thoroughly de-fluffed and a single drop of oil on the bobbin race with every bobbin change.
Needles get changed when I start having thread issues or need a different size because I switch to a different size of thread. OOPS...wrong topic!
My sister has a new Janome and both the dealer and the manual says NO OIL! :shock: