I picked up a 1985 150 Mercury XR2 from Rees Guide who was using it with the oil injection system disconnected. I had the oil lines, pump, and reservoir redone on my motor last year. I torched #2 cylinder somehow (age and ethanol in fuel I am told are probably the culprits) and now want to know if I should put my oil injector stuff on the motor from Rees. He had stated that it idled a little rough and I am thinking the oil injection may eliminate that problem. Then again, I don't really trust those injection units and my previous boats both had the oil injection disconnected by me because I figure, if you mix your oil and the engine is running, you know it is getting oil. Thoughts anyone?