Sounds like he went from a Yamaha to a Merc and now thinking about an SHO. Key to keeping these newer motors alive nowadays in all of my observations has turned out to be correct additives. Especially with these guys that have to run balls to the wall all of the time.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD