Thre's zero need to use a non synthetic oil during the break in. Why rush the break in? I don't know about you other floks, but like Pe and Dick I prefer to have the best possible lubrication running through my engines from the first spin. I just can't understand the reasoning where some manufacturers tell the customers to use a lower quality oil during the break in or first few gallons of use. Perhaps they want the engine to wear out faster so they can sell more. That's the only logical explanation. Tell your significant other you put sand in the Vaseline to help loosen things up sooner. They'll think you're crazy too

Who said synthetics have to be run at 80 and 100-1? If you remember the three purposes of oil it would be reasonable to presume that more oil would do some of those jobs a little better. Especially in cooling and cleaning. More oil does not necessarily create more carbon. The way the engine is tuned, loaded, and run has more to do with carbon development that the quantity of oil, although some oils generate carbon tracking long before others. The design of the exhaust system also can contribute or delay carbon development.

Using the size prop you intend to fly with loads an engine during the first few hours much better than using a smaller one. Using a smaller prop for running in is something left over from glow engines and tapered cylinders where you want to keep them from heating up and sticking. It's useless for gas engines.