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Thanks for the reply. I've read too many negatives about sealant mixtures and I don't like the idea of a temporary fix. I also don't like the idea of being stranded if it were to suddenly get worse, so it looks like replacement of the plug is the way to go. I've been watching a few videos on removing and replacing these plugs and it seems like it is worth a shot to give it a try myself. It looks pretty straightforward once I get the starter motor out of the way and that looks pretty easy, too. I think I'm going to gather the materials and give it a try. Fingers crossed.