BDPetersen Posted September 26, 2023 Report Posted September 26, 2023 I almost made the title “How often do you change oil in your spark plugs”. Today I decided to remove the bottom plug in my #2 cylinder, as one does. But when I pulled the lead out of the plug, I was amazed to find it (the lead) dripping oil. Hmmm, thought I, I’ve never seen that before. I imagined that when I pulled the plug it would be cracked or something, but no . . . air tight. The electrode end was unremarkable but the lead chamber was oily. Now, mind you this plug spends its life upside down. How in the world does oil climb inside a plug? I didn’t see any particular oil leak on the outside of the engine. Is it possible a plug wire could be a conduit for oil, assuming there was a way for oil to get inside it? The engine was running fine. On 1st mag check, roughness was sometimes attributable to #2 cylinder, but would clear and be normal in flight. Any thoughts?
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