I've used these products in the past. It seems like its hit or miss, and I probably would not use it again. I have had it congeal in the radiator in my Wrangler & it became an even bigger mess when I went to replace the head gasket. If the car is something you're going to keep for a long time, it'll be worth planning for replacing the head gasket/radiator and flushing the entire system. The longer this goop sits in the engine, the more likely it'll get stuck in the cracks & crevasses.
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