I forgot,
My brother-in-law and I tried to run Amsoil in a 88 120 Johnson VRO. It did not work with that motor. It had something to do with the size of the orifice.
FYI
Jeff

You can’t go wrong, synthetic is the answer, Amsoil is the best. I run HP in my 89 135 Merc. It preforms great and it smells better than conventional oil. You should also try the PI, its a fuel additive, it will keep your fuel system clean. It works! My dad and I run Amsiol in everything, even the farmall M! Amsoil also has premix oil.
Jeff

Best bet is to go to a well known camera shop and tell them what you needs are. They will be able to steer you in the right direction. Some places offer classes to show you how to operate digital cameras. If you are using it in the boat, get one that is at least sealed.
Good luck!