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I have never tried Seafoam in the crankcase, but have had good results with running it in the gas tank. I also like to use Marvel Mystery Oil in my gas. I have a buddy that runs MMO in his crankcase.
Yeah, that MMO is some serious stuff. You can literally use it everywhere on your vehicleOn my last truck I used a quart of Marvelous Mystery Oil. When I bought it, the valve covers leaked horribly due to the fact the gaskets were as hard as a rock. Under the valve covers was black sludge everywhere. A few months later when the weather got cold, I got a lifter tick that would go away once the oil warmed a bit. I added MMO and after a couple of weeks of occasional driving, the tick totally went away, man that oil was black!
Guess you can add to all of our success stories now so far. Since you're running it in the oil and through the fuel, you may as well run some through the vacuum line as well and hot soak it. Clean up your intake a bit.I went out and ran it for 15 or so after adding it to the gas. It had a lifter tap that went away after about 5 minutes of running. Ha, sounds like its working.