Quick seafoam question...

Ok, I know there is some ridiculous 23 page or whatever, thread about seafoam...but I just have one quick question. I pretty much figured out where to put it in, going to the pcv valve, but do I need to change my oil after doing this method, or just after sticking it in the crankcase? Thanks for saving me the agony of sifting through all those damn posts.
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If you do it through a vac line, no you don't need to change the oil afterwards. This method just distributes it through the intake and cylinders.