$35 for grease? I've rebuilt allot of things that have O-rings, car engines and dozens of jet engines (USAF/civilian). The O-rings used in the spark plug tubes are probably made of neoprene so they don't degrade while being exposed to petroleum products. You can use something as simple as Vaseline to lube the O-ring so it won't get cut when installing.
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Sadly on the outside looking in.
"Drive it like the Doctor ordered"
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