I did a search for it, read a few things, and got a couple of questions.

My car is a 2000 v6, has 114k miles on it, had a tune up 40k miles ago, and just had a new cat put on it. I'm thinking of using seafoam on it and was wondering what effects it would have on the plugs, O2 sensors, and cat.

Thanks

 

It shouldnt hurt them I use it in the intake evry 2-3 oil changes.

 

O2s' might get clogged, depending on how much carbon deposits are discharged in the combustion chamber from using Seafoam in the intake...