I have a Piaggio MP3 500. During a ride I get a warning light "oil" and my engine stalls. After a stop I check the oil, it is nicely level. I start the engine back and it "runs" nicely for 15 seconds later a "screeching" sound coming up...back at home I check the engine. I take out the complete vario and start the engine again, again a high-pitched screeching sound from the inside of the engine. Waited a while, tried again. The first 15 sec everything is ok, then an emerging screeching sound. Nafenoeg the oil lamp continues to burn. There is enough oil in the motor. Anyone have an idea what this could be?