indysheart,
Not to be argumentative, but there is more to servicing a potted motor machine than just oiling it. The motor and the drive gears need grease. There are two grease pots at the bottom of the motor with screw caps. To grease it you'll need to tilt the machine on it's back side, remove the screw in covers and using Singer Motor Lube ( grease - not the white stuff ) only, add grease to the grease pots. The grease pots lube both the motor bearings and the drive gear so you need to use the right grease. ( If you can't find the Singer Motor Lube in the tube, you can substitute petroleum jelly.
These machines are pretty bullet proof, but they do need to be maintained properly. Get an owners manual if you don't have one and read it.
Joe