Grannymom and Zipit are right. Get Singer lubricant, it will be in a tube, you don't want to use oil...the gears move too fast and it will just fling the oil off. Open every part of your machine that you can and check for places that may need a bit of lubrication other than oil. Oil is generally for the "hinged" parts, you want the grease for the gears...
Do NOT use lithium grease! That stuff will harden up and be IMPOSSIBLE to remove...it causes problems in the long run... ask me, with my 201K how I know this? :(