A friend of mine just plunked down a deposit for twin Yamaha 150 4 strokes for his new 25' Bluewater CC. After reading MANY posts from guys all over the web about 115 Yamahas "making oil" I'm wondering if the 150s have any issues. He typically trolls 4-6 hrs for every 1 hr of high speed operation. Anyone know if he should avoid the 150 4 Yamaha strokes? His options from Bluewater are 150 4 strokes or 200 2 stroke Yamahas and he really wants 4 strokes.