Let's use our lighter example to substantially simplify the solution. Assume you're trying to start a campfire, but your lighter is contaminated with engine oil. You'll ignite the campfire eventually, but only after multiple failed attempts. Consider a spark plug for a moment. There will be no ignition or combustion if there is no spark. Fuel will be provided, however, it will not be burned when it exits the cylinder. What Causes Oil on Spark Plugs? One of the few components in close touch with the combustion process is the spark plug. In contrast, engine oil should never come into touch with spark plugs. So, how does oil get to the spark plugs of an engine: 1. Bad Valve Cover Gaskets Cylinder heads are made up of more than just spark plugs. Intake and exhaust valves, valve springs, cam(s), valve guides, and other components may be included depending on the engine configuration (OHV/SOHC/DOHC). Because the majority of those components require l...
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