Personally I would not mix it with the old oil, but wouldn't hesitate to run it. Try and run your tank empty, and then fill up with the synthetic oil. Some synthetics don't mix well with mineral oils is why I suggest that.
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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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