Thinking of using Amsoil Saber Professional this winter. Thoughts?
I'm sure it would do fine, but why not try and find somethng better. Remember, oil is cheap engines are not....
How does one determine that a particular oil is doing better?
Do you take the engine apart and measure cylinder wear? Do you think you might "feel" more power? Maybe I am just not an "engine whisperer"....able to read my engine's little nuances.

Generally, I cannot tell any differences in oil type used.
Maybe it smokes less or has less muffler buildup, but that might not relate to cylinder or bearing wear.