Just had my Dad’s 40 year old Homelite 240 serviced after sitting for 30 years. Needed carb rebuild. The repair shop said the engine was still in excellent condition for its age. They recommended to start using Opti 2. Before I could use it myself, my cousin asked if he could borrow it for a day. (His Husquvana’s chain brake had froze and he needed to finish a cutting job). I Told him it was just serviced, fresh sharpened chain and that I had filled the tank with Opti 2 mix. He had not heard of this oil. When he returned the saw he told me that within ten minuites of cutting the saw seemed to be getting more powerful with no bogg. I told him he was not imagining the increase of power. The crew at the repair shop had told me that once the Opti 2 started coating everything it would start running stronger. All I can say is WOW! What a SUPER Product!!!!!!