Its not magic, its just better in an air/oil cooled motor application.
Short and sweet. Lost power 8pm friday night, got it back 2 hours ago. Ran the generator non stop the whole time. Generator is brand new and changed the break in oil per the manual. Put SYNpower 10w30 full synthhetic in and ran it at twice the hours in the manual.
Just got done doing the valve adjustment the manual says to do. Well, I did not have to adjust the valves. When I checked them, if anything they were still a little tight per the specs. Ran so good and did not burn a drop, I figured I would leave them where the factory put them.
This is the first generator I ran synthetic in after break in. Never seen any oil pour out in that good of shape at half the hours as I ran the synthetic. That little motor runs hotter and at a minimum of 3,600 RPM. Burned enough gas to ride 1,000 miles.
Our air/oil cooled motors can and will see the same benefit. Since I switched to synthetic in the Harley just over a year ago, I noticed the same advantages.
No magic, no koolaid. Just my observation. I never seen a generator run that long, that hard and that hot and not need valve adjustment ever.