Year is O6 I have heard this is around the time that they "rectified" the unreliability of the early Optimax. A dealer told me a few years ago that Mercury was going all 4 stroke. Don't know if they did or not? This is on a 19 ft. Trophy and only has 180 hours. Seems they are loved or hated just like E-tech?
06 is still 13 years old and fuel system needs really good attention/inspection along with air compressor. On 1-10 scale it is in the 5 range as 09 they started getting reliable.