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I have read that seafoam is a rather aggressive cleaner. That being said, I would think using such an aggressive cleaner on a vehicle with gunk in the internals could create some issues since in many cars said gunk ( I have been told) can help "seal" worn internals. Thus if these are removed by the cleaner it can create leaks. Again this is all speculation and things I have read about from other users online. All I know is when I used it on my 120K altima, it did clean, but later I found alot of oil/gun in the intake manifold and a clogged PCV valve. : /
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