The one Merc 150 I owned didn't have oil injection so I have no experience but I did a Google search and found a few things to look over.
https://www.google.com/#q=how+to+dis...rcury+outboard
I'm sure Spare or Therm will chime in soon. as well.
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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