sport pilot sport pilot Synthetic oil does protect better as long as you don't over heat your engine or run it lean. Some older engines require the castor because of certain parts as this engine the castor will help.
Sport do some reading on oils before you lead people in wrong direction. I have been wrong before as most of the time I will not comment on things like this until I have researched some stuff. I just see most of the time people think because they are a pilot or a jet engine mechanic that they know everything.
So if you want less oil on your plane either put exhaust so it isn't on the plane or run less oil.