If you read the directions for seafoam. It can be used in the oil, fuel or intake. I run a handyman business, work on alot of small engines, tractor, stationary equipment, and i also work in a bus garage. Seafoam is a go to for many things, iso-heat uses alcohol to remove water and keep lines from freezing. Seafoam will stabilize, remove water, lubricate, soften carbon, remove gum and residue. I use it alot to keep systems clean. Carb problem, fill the 4 stroke carb full let sit over night. Fill the tank with fresh gas, fixes alot of issues. 2 stroke, mixe the oil with seafoam as gas. Or add seafoam to gas then mix the oil in.
Using it on carbon, never used seafoam on engine parts removed. Best way and it can tell how bad an engine is, start the engine and get it hot. Once its hot spray or pour seafoam into the intake. Just a little till the engine rpm change, then increase till the engine dies. Or if it doesn't, it shut off, here is the big key you have to wait till the engine has cooled. Restart the engine it can be hard to start with the amount in there but as soon as it starts rev it to the middle of the throttle and hold till all clears. I have done this and had alittle visible exhaust, to a 2 block smoke screen. Used this method on a friend's toyota 4 banger that could barely climb a hill. It had to be done every month but kept that engine working for 3 years and commuting to work till she had the money to buy a new car.
Its not a cure all, but can fix a problem or be used to maintain. I used it to fix a sludged lifter too, but be careful we put it in the oil and had to change the oil and filter 3 times. It loosened up so much crude but we planned for it. I have also used atf in oil, just depends on whats going wring. I use it too for starting fluid in diesel and gas engines. Lucas upper cylinder lubricant and cleaner works well too, in Wyoming and -40 temps we used large amounts of lucas as line antifreeze, water remover. Only thing i found to work below -20 and it was a trucker buddy told me about that. I have had more than a few customers amazed how seafoam works but i always tell them its tool not a solution. And we need to fix the problem, my son has started a small engine service and repair. His go to is seafoam to see if it is worth fixing, then there is the rack of predator engines if not. And we use seafoam by the case and he has installed 22 predator engines.
On another not i have a gmc 2500 hd which throughs a cel code for the o2 sensor, this is a modified engine purchased that way. It was a gm crate motor installed by a mechanic and always would intermittently cel on. Started using seafoam every month and no code mechanic checked it out and everything and cant believe it 1 year and still no cel. He cant explain it!!
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