You add it to the gas, it's perfectly safe. Just type in Seafoam in the search box on youtube and you'll see people who did "howto" videos with it.
Follow the directions on the can and you'll be ok.
The only difference, at least for me personally, is that I would not add it to the engine oil.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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