YAMAHA's oil injection is one of the best second only to SUZUKI's(the only reason SUZUKI's is better is because there reservoir is under the cowling instead of remote mounted). They have a bronze gear on the crank and a steel drive gear for the pump shaft, so VERY few failures there. There only weak point is the remote oil tank set-up which is dependant on a switch and oil pump to get oil up to the engine. The pump is VERY reliable as it is rubber encased, but the switches do fail every so often. As for swapping out your I/O, I wouldn't. The 3.7L is a good engine for the most part, and will be HARD to beat for economy and reliability.
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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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