I am the original owner of a 1998 boat with a 5.7 250HP Mercuiser I/O (6.5 years old now). The 1998 Mecruiser brochure I got with the boat says that this motor has ceramic coated exhaust mainfolds and elbows. <br /><br />The boat has 320 hours on it and has been fresh water flushed religously after salt water use and stored on a lift out of the water. <br /><br />There are no signs around the riser/manifold gasket of leakage and the spark plugs and oil are clean.<br /><br />Does anyone here know how much time these ceramic coated exhaust parts should be good for?<br /><br />Thank you.
