Thanks for your insight. I can tell your an expert. I digress.
funny, I coulda swore that mercury recommended 92 octane on the 300 pro max and the 300x promax
well I should state that I know for FACT that the on the 300x 92 octane or better is called for...I'd have to look the 300 pro max up...but your the expert.
I might be wrong on this, but I think 300 pro max compression is around 120-130 not to be more then +/- 15 lbs . Page 1-21 of the service manual. Can you show me otherwise?