What is the powerhead on the 2004 Mercury 15 hp four stroke? Is it Yamaha, Tohatsu or Mercury? They are all good powerheads but I thought I read somewhere that it was a Tohatsu/Nissan but it looks like it matches closer to the Yamaha specs. Local Mercury dealer told me that if purchased before April 1 I get extended 5 year coverage rather than the standard 3 year.
