Hello everyone. I have a Kymco xciting 500 and have been using mobil 1 oil. This machine has no cluch and wanted to ask what flavor you think is best? 5w40 or the 15w50? Bike calls for 5w50 but says if not available follow chart. Chart shows 15w50 good for 35 degrees to 100+ degrees. Just wanted to ask my fellow bitogers for there opinion!! Thanks guys!