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There may be more fuel going through the combustion chamber than the spark plug can ignite. The excess fuel seeps through the (main or head) gasket and into the oil sump. You should check the compression with a compression checker in line with the spark plug and the condition of the spark plug, the carburetor setting, the operation of the choke, or even the condition of the air filter.

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Q: Why is gas getting into the oil on an older kohler engine?
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