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2,626 Posts
That sounds like the way to do it to me. I fed my 2006 4.7 about half a bottle through the vac line and it didn't hurt it. I couldn't tell any positive difference either but I like to think it was cleaner on the inside, lol. I don't think it matters about the oil change as long as you are only running it through the induction system or adding it to the gas tank and not putting it in your engine oil. Some have done it and it may be fine but I personally don't recommend adding Seafoam or anything else to your oil.
