I have been using IPONE Scoot City synthetic 2T oil for 4 months now. It is by far the best oil I have used. I checked my spark plug recently and it is practicly clean. Product also has a strawberry smell which helps to know when your oil mixture is working. My scooter smoke output has been reduced and I am getting better fuel efficiency. I would recommend IPONE products instead of the other oils. After switching to it, I noticed better take off speed. My 09 Andretti Benelli m50 tops out at 43mph. High quality oils are important for these small 49cc engines.