Sea Foam in a Mercury 4 stroke outboard [SOLVED] Asked by Abe Y. In Kansas Does Sea Foam work in a new (2022) Mercury 4-stroke outboard (200hp pro xs)?
Yes! Sea Foam is safe and effective in a Pro XS. It will help clean, lubricate, and protect the entire fuel system and critical engine areas. I’d also consider using Marine PRO (works very well in outboards!).