A couple times my 34cc sounded like it was starting to sieze and grind, and I was using synthetic oil. I stopped it and tilted the engine around so that oil could get all to all the bearings and it seems to be OK. My thinking is that the engine was designed to be bounced around and tilted as it is used for a weedeater and that the oil would get to all the critical areas. When it's flying, it shouldn't be problem either, but just stting upright on a bench the oil mostly sits at the bottom. Not sure about that tho. 3 oz. of oil seems like so little. As you see in the photo, I doubt that the oil comes up to that inner crankcase. I would like to put a plexiglass back on the case and watch it as it runs.

Rod S