When I first started renting boats out to local fisherman, I only had a few boats that I was renting out. I was having a hard time with the maintenance for these boats because they all ran off of different kinds of motors and required different care. I realized that I really needed to standardize this much more so that I would be able to easily care for the boats.
I ended up buying a bunch of Evinrude outboard motors that I would be able to put on each of the boats in my fleet. I switched the boats over to these outboards so that I would be able to use Evinrude Johnson 2 stroke outboard oil in all of them without any difficulty. It is great to be able to run these boats with no problems because I can maintain them all easily.