How to Change the Oil on a Generac Generator

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A standby power generator for your home can provide a sense of security; but you must properly maintain it, including regularly changing the oil and filter. Generac produces a wide variety of generators, but the oil changing procedures are the same for home generators ranging from 8 to 20 kilowatts, the most common sizes. Change the oil and filter every two years or 200 hours of operation.

Things You'll Need

  • Oil
  • Oil filter
  • Appropriate container for used oil
  • Start the generator and run it until it warms up.

  • Turn off the generator and remove the oil drain hose from its spring loaded mounting clip.

  • Remove the cap from the end of the oil drain hose and let the oil drain into your container. Hold the hose until all the oil has drained out.

  • Replace the cap on the end of the drain hose, and return it to its mounting clip.

  • Remove the oil filter by turning it counterclockwise.

  • Put a light coating of oil on the gasket of your new oil filter to make a better seal.

  • Screw the new filter on by hand. After the gasket makes contact, tighten it no more than a full turn. Do not use any tools.

  • Fill the engine with new oil. (The amount and grade depend upon your generator size and the temperature in which it operates.)

  • Start the generator and let it run for one minute. Turn it off and check for leaks.

  • Check the oil level with the dipstick and add more if necessary, but do not overfill.

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