Re: 1999 MERCURY 60 HP OUTBOARD MOTOR 2 questions ?
1, Only if you have reason not to trust your oil pump, in which case you need to address the problem.
2, Maybe, but we have no idea until you give us some info. What kind of boat, what prop is on there now, how many RPMs are you getting at WOT, how many are you supposed to get, what kind of speed are you getting now, etc. etc. etc. to quote Yul Brenner.