Overfilling your oil tank can also cause this on a Merc. Mercury pressurizes the oil tank via a hose with a checkvalve in it on the bottom cylinder. If you overfill the tank with oil, start the engine, shut it off without using much oil, as the pressure in the tank bleeds off through the checkvalve, oil will pump back into the engine as the pressure supply hose is lower than the filler on the tank. Learned this one the hard way on my XRI when I put the oil injection back on it to sell it. Guy showed up to see it run and I ended up smoking out the yard.
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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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