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rotorwrench · 11-29-2021, 08:19 AM

Run some Marvel Mystery oil additive in the fuel. There are instructions for mixing on the product container. MMO was and still is used in many old airplanes that use the small Continental 4-cylinder engines to prevent valve problems.

11-29-2021, 08:19 AM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Badly worn Valve guides Run some Marvel Mystery oil additive in the fuel. There are instructions for mixing on the product container. MMO was and still is used in many old airplanes that use the small Continental 4-cylinder engines to prevent valve problems.