It's a high potency cleaning solution.Says to use in oil,that over in time it'll help clear some internal deposits along oil paths.Now the way I see it is,don't use this in your oil or any sort of motor flush if your motor has very high miles unless you know for sure most of the internal gaskets and seals have been replaced.On motors with high mileage,the excess deposits acts like a seal in itself.Excess deposits could be helping to seal an oil leak somewhere or they could be giving you a slight compression boost.Use at your own risk.
Using in your intake,it clears up excess depoits in the runners plus it may clean up the combustion chambers.Use in your gas like any other fuel injector cleaner.
IMO,it works pretty good.Just dont go overkill on it.I can vouch that this stuff really does work.The V6 that I use as a daily driver (Def. not my 5.0!!) I never had a service shop clean them.Waste of money.Just insisted of finding ways to do it myself.Now,45,000 miles later, I used Seafoam..after using the Seafoam,I decided to pull the injectors.Was going to manually clean them out.But then found there was hardly a bit of carbon deposits on them.It was basically on the side of the injector,nothing was on or near the injector pinhole.Not bad for the money.
Edit- - - - - - - You can get Seafoam at Advanced/Discount Auto Parts...Pep Boys may have it.Also check Auto Zone.And if your from the north,Try Murrays Discount Auto Parts.