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I've had good luck with Sea Foam as well, I have not used any of the 3M fuel system cleaner nor have I even seen it for sale any where.
I think the idea behind putting sea foam in all parts of your engine at once is that you eliminate the risk of just moving the gunk from one place to another, that any crud that blows past the rings stays suspended when it gets to the oil and any crud that comes out of the PCV valve gets cleaned away as it's sucked in to the intake and hopefully burned up.
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