Yes, I agree about reading your manual...and it is always a good idea to follow the cleaning and oiling instructions
and I use the brush that came with my machine to clean out all the lint and or threads that may be in you bobbin area... I do not think it is necessary to oil each time your finish a project. I would also call you dealer if you have any questions at all on your machine.
I was told by the sewing machine center what I bought my Janome ... I should bring in my Janome sewing machine to my dealer and have it serviced once a year if you do allot of sewing. To keep your machine in good working
condition. A good sewing machine is quite expensive to be replacing it and your machine should last for years.
Your dealer is your best place to get all your questions answered on your machine, besides your manual.
Have Sewing...and Have a very Merry Christmas.