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I have used seafoam, and I believe it works. No tear downs to verify, but my '71 BB certainly runs better when she has her treatment. No question I'm an "additive type", as I believe there are two forces at work in my vehicle - carbon fouling in the engine from a lot of idling, and I also...

My two cents are that in addition to the consideration of lubrication, is temperature, and the rated abilities of dino and synthetic to not only resist breakdown, but transfer heat. From what the literature seems to say, synthetic is superior in both areas. These were the primary consideration...