Adding seafoam

Depends on what your using it for, seafoam can be added to the fuel tank as a fuel injector cleaner/ fuel stabilizer, or it can be added to the crankcase oil, supposedly to free sticking or noisey lifters, but if your having a runnability problem( not running good) this is not a cure, and those problems should be addressed, with that said, I use seafoam as a fuel stabilizer in my 2 cycle engines over the winter, and occasionaly in my vehicles, it seems to work fine as a stabilizer, also read the directions on the can as to how to use it, and how much to use.