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Check your bottle of sewing machine oil. If your sewing machine oil is cloudy, golden or yellow, it has impurities, and can gum up your sewing machine parts and it's time to get some new sewing machine oil.
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Sewing machine oil should be clear or if you are using Bluecreeper sewing machine oil (SMO), which is blue.
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Place your vintage bottle of sewing machine oil on your display shelf as a keepsake, and use either clear sewing machine oil like Lilly White or Bluecreeper SMO.
For Modern machines, most only need a drop of sewing machine oil on the edge of the hook race under the bobbin case, and a drop on the wick (if your machine has one).
For Vintage machine, they need to be oiled more often, as well as a drop of oil on the edge of the hook race. With older machines that have oiling ports, they need oil more often, depending your usage, as well as oiling periodically for machines that will be sitting for a while.
If you are not comfortable with oiling your machine, feel free to schedule a quick clean appointment.