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Call me a skeptic ...
- I am 100% sure that you are right not to add it to the engine oil. Doubt a little would hurt as it is a petroleum product and generally compatible with oil. Engine oil is designed to dilute, emulsify and isolate other liquid contaminates (water,coolant) in any case.
- The Material Safety Data Sheet (Seafoam MSDS) has some interesting info
- Contains only three ingredients ...
Pale oil = a clean oil heavier than diesel fuel.
Napatha = Coleman Fuel and charcoal lighter fluid
Isopropyl Alcohol (IPA) = You guys know what alcohol is for!
- Lists as a Combustion Hazard - Irritating smoke and fumes
Why not make your own -
Homebrew Seafoam - Although I would use a two cycle oil in place of the Pale oil since it is designed to be burned.
Not arguing, just adding but MSDS sheets are only required to list "Hazardous Ingredients" not by any means all ingredients. It is possible or even likely that there are some non-hazardous surfactants or minerals that participate in the reactions and make the difference.
It is also possible that these are the only 3 ingredients but the MSDS doesn't tell us the whole story.

instead of seafoaming, we took apart my whole intake manifold while doing the starter and cleaned it out
If we had more time I would've polished it out and then gotten it powdercoated black....
Not arguing, just adding but MSDS sheets are only required to list "Hazardous Ingredients" not by any means all ingredients. It is possible or even likely that there are some non-hazardous surfactants or minerals that participate in the reactions and make the difference.
instead of seafoaming, we took apart my whole intake manifold while doing the starter and cleaned it out
Ding, ding, ding...
Stop wasting time on snake oil and take the TB off and clean it correctly. It will take a nice leisurely afternoon on a weekend to do.
The smoke effect is fun....
Especially at rock concerts.
But I thought it blew deposits off the entire intake system including the valves?
Quite a few people swear that adding water in small amounts to the intake is a good cleaning method.
Ding, ding, ding...
Stop wasting time on snake oil and take the TB off and clean it correctly. It will take a nice leisurely afternoon on a weekend to do.
The smoke effect is fun....
Especially at rock concerts.

But if it does make some positive difference, even if small, and doesn't hurt anything, and you can afford it, why not...