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Kohler 12RES — Oil Change Procedure

Maintenance · Engine lubrication system

For the Kohler 12RES, from the Kohler operator's manual.

Applies to: Kohler 12RES, Kohler CH 740 engine

Before you start

  • Hot engine and exhaust system can cause severe injury or death; do not work until cooled.
  • Accidental starting can cause severe injury or death; disconnect battery cables before working.
  • Dispose of all waste materials (engine oil, fuel, filter, etc.) in an environmentally safe manner.

Parts for this job

Part numbers from the service-parts list for Kohler 12RES. Verify against your serial number before ordering; some links are affiliate links.

Procedure

  1. Place master switch in OFF position and disconnect power to battery charger.
  2. Disconnect engine starting battery, negative (--) lead first.
  3. Remove housing side panel and oil drain hose from retaining clip.
  4. Remove cap from oil drain hose and lower into collection container.
  5. Open oil drain valve and allow oil to drain completely.
  6. Close oil drain valve; replace hose cap and hose in retaining clip.
  7. Remove oil filter by rotating counterclockwise with an oil filter wrench.
  8. Clean gasket sealing surface of oil filter adapter.
  9. Apply light coat of clean oil to rubber seal of new oil filter and install.
  10. Remove oil fill cap and fill engine to F mark on dipstick (1.9 L capacity).
  11. Reinstall dipstick and oil fill cap.
  12. Reconnect battery, negative (--) lead last, and battery charger power.
  13. Start and run generator set one minute; stop, wait 1 minute, recheck level.
  14. Check for oil leaks, fix as needed, and reinstall housing side panel.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Engine oil capacity: 1.9 L (2.0 qt.)
  • Oil level: F mark on dipstick

Full service-parts list: Kohler 12RES →

Source: Kohler operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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