Jan, after you totally empty the bobbin area manually , take a Q-tip that you have placed a DROP of SEWING machine oil on just swap the very center of the bottom of the bobbin area...do this after you have cleaned that area really well..vacuum it out if you have a nozzle small enough..do not blow into it with your breath...that just pushes the fine dust into the crevices...
Today,
If a machine comes with oil when you first purchase it ..it needs to be oiled..If it didn't..you don't need to..
I checked it out the minute I saw it in the storeroom of the gallery...It sews beautifully..I do need to clean out the whole bobbin/needlebar area..This machine will go down south next time ...