New boat owner her so go easy on me. I was told by the dealer that I should replace the zincs on my Mercruiser I/O. The boat I just bought is a 2003 Bayliner with a 3.0L Mercruiser that has 125 fresh water hours on it. I am no metalurigical engineer but they look pretty good to me. What should I look for and do I really need to worry about replacing them for next season? The boat is in storage right now so if they do need to be replaced I would have to do it in the Spring of 2010.