I didn"t mean to ruffle any feathers here. And no I"m not a molecular scientist so no I couldn"t tell you in scientific terms that would satisfy you. But I do have 35 years of experience in tuning up cars trucks and motors of all kinds. Wish I had a nickel for every plug I"ve ever changed. Due to the heat and vibration and stress factors on the plugs the ceramics on a plug over a LONG period of time can become brittle and crack which could cause misfires or worse. Like the other posters said repeated cleaning can cause pitting, corrsion, and loss of material which can cause incorrect firing and loss of power. Depending how you use the tractor it could take years for these things to happen. And depending on how your engine runs it might never happen. Different plugs are made from different materials. Some are better or worse than others. It"s your judgement call what plug to use and whether or not to reuse them when the time comes or replace. Simple as that.
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