These machines do drink the oil so maybe it just needs a bit more than you gave it since had not been used for a while. Did you run it for very long? If not, maybe run it slowly a bit more to make sure the oil has gotten down into all the areas it needs to. And yes, check the bobbin area for debris and to make sure it is oiled there. Hope this works it's way out to running more quietly although as patmadrid mention, they are not real quiet machines but I am assuming that this is louder than it ever was when you used it before so abnormal for your machine.