The most common cause of what your talking about with an oil injected MERC is overfilling the oil injection tank. When you shut the engine off with an overfull oil tank, it will push oil back up into the crankcase through the hose used to pressurize the oil injection tank. My flats boat used to do this because the oil tank didn't set level, so you couldn't fill it up but to about 80% without it pushing oil back into the crankcase when you shut it off.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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