This subject gets beat to death. Been a mechanic for well over 30 years. Never and I repeat Never has even one manufacturer ever used lube of any sort on any spark plug thread ever...
Neither has my ex wife, I suspect because she never had to change a set of platinum plugs after 100,000 miles or cared.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
