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Kohler — Follow procedure below.

A Kohler service procedure — check it applies to your exact model before use.

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Procedure

  1. Add Kohler PRO Series fuel treatment or equivalent to fuel tank. Run engine 2-3 minutes to get stabilized fuel into fuel system (failures due to untreated fuel are not warrantable).
  2. Change oil while engine is still warm from operation. Remove spark plug(s) and pour about 1 oz

Source: manual:14_690_11_EN.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.