Consult your owner's manual. If it is a computerized machine, follow the instructions, apply 1-2 drops using the oil specified, and do ONLY what is instructed--nothing else. Oiling computerized equipment could cause serious damage. Usually, the only oiling required on computerized machines is on the hook. Oiling should be frequent, at least every 8 hours of sewing time.
If it is mechanical, clean first and then use Fresh GOOD quality sewing machine oil, 1-2 drops each spot. Slowly rock the handwheel and observing where metal rubs on metal, apply a couple drops. If oil ports are observed, apply 1-2 drops each also. Hit the moving parts in the top as well as under the bed. AND don't forget to move levers & dials and apply oil there as well. AVOID oiling plastic gears, cams, and belts!!!
Mechanicals require frequent thorough oiling, ie perhaps every 40 hours of sewing time (or every time a new garment is begun) to keep it in good running condition, prevent excessive wear, prevent the old oil from solidifying and freezing which can cause a burned out motor. Oil the hook every 8 hours. If the mechanical is stored without operation, perform a complete oil every 6 months.
BTW--3-in-1, WD-40, cooking oil, or old oil cans in grandma's sewing basket are NO-NO's for your machine! Spend a few extra dollars for fresh good quality sewing machine oil and keep your machine and yourself happy!
Cleaning out any machine is good , as most don't get \done get done to often , id be cautious on oiling a machine and only use a oil spec'd by the mfg. as some oils can soften and damage gears and such on some machines , oils should always be used sparingly and not left to drip down inside to points unknown , me id prefer to use caning wax for lubrication, as it never runs from where you put it like oils will
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