One of the biggest mistakes that Mercury ever made was that fear. They made it out of plastic. When engines started blowing up because of no oil they just kept making them out of plastic instead of switching to a brass or Stainless gear that would have solved the whole problem.
When I go my 200 Merc engine I was lucky enough to to find a company that made an electronic oil injection system. Bought one years ago and have had zero problems with my oil injection ever since. Unfortunately, from what I can find out, they are now out of business so that system is no longer available. Not much need for one on a 4 stroke..... <sigh>
I'm retired, but I seriously think I'm going to go back to work, take all the money I make and buy a new 4 stroke. I figure 20K should do it. The trick is going to be finding a job near enough that I don't have to use a lot of gas to get there.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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