There is a big difference in experience on hybrid 4 cycle equipments from both Stihl and Shindaiwa. Some people swear by it and some swear at it. Can you guys kindly respond by telling us what gas you use, what oil and ratio you use and result of your experience? If you have open up the engine, please tell us your observation. Reason I ask is because all the posts about these hybrid 4 engines. Some people really have good luck and some don't. There might be some truth of what stuff you put in. We can learn from it.