I would like to run Seafoam through the PCV system and gas tank, but I recently changed the oil. I don't want to dirty up semi-fresh motor oil. Is this safe to do? Can the seafoam get mixed in with the oil?

 

you can put seafoam directly into the crankcase so no but I think it directs you to change the oil shortly there after

 

If I used Seafoam through the PCV, would it get into the crankcase? I don't want that to happen because the oil is still fresh.

 

I'm not a big fan of using Seafoam, but if your intent it to use it thru the intake and clean intake manifold, valves and pistons, the best way to do it is to remove one of the vacuum lines from the intake manifold (the one to the brake booster is readily available) and let the engine suck it in from there.

When you run seafoam, even thru the intake, the engine will run extremely rich and some of the combustion by-products will work their way into the crankcase. So if you are going to do it I would recommend waiting till you are due for an oil change

And I know people do it, but I personally would not recommend adding seafoam directly to the crankcase...it's a solvent and it will dilute the oil. Use a high quality motor oil and you shouldn't have to worry about sludge build-up.

 

Thank you