Yeah, seems like all you see anymore for I/O engines is Mercruiser and Volvo, which do indeed use automotive engines. I'm not sure if there are even any other m

Yeah, seems like all you see anymore for I/O engines is Mercruiser and Volvo, which do indeed use automotive engines. I'm not sure if there are even any other manufacturers left. I'm less familiar with outboard engines, and I don't know what is more common (I/O or outboards) for recreational boating. In the Great Lakes, I/Os appear to dominate, but I've noticed that videos of boating in Florida and the east coast show a lot of outboards even on the bigger boats.