Confused? The generator portion shouldn't need any "break in." The engine on the other hand does. What I do with all my small engines is run them with no or lightly loaded for the break in period to allow the engine to "break in" without lugging. I then put 5W-30 synthetic in and follow the oil change intervals as recomended and don't try to take advantage of "longer intevals" due to synthetic oil. I also know folks who start up a new engine and load it up and "really break it in." Your engine, your comfort factor I guess.