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I have a 2004 SeaRay 200 Sundeck with a 4.3 MPI/EFI 220hp - 2004 Mercruiser, 151 hours on the engine. Boat has been operated in saltwater since new. After each trip, flushed 10-15 minutes, including using Salt Away at the end of the flush. Boat operating temp is 160 degrees during normal...