"jamesgangnc" wrote in
ups.com:

Truth is that not very many recreational boats simply wear out the
engine.

There is not much that is mechanically different from a "newer" i/o
engine and one from 20 years ago.



I don't think there is much danger in worrying over how long the engine
will run. After all, long before it starts to use oil, either the damned
tilt won't run up and down, the transmission pawls won't shift into gear,
or the rubber diaphram will rupture, flooding the boat...making the choice
of engine oils seem very unimportant, indeed....