I just bought a new ECHO SRM-2620T yesterday. The dealer said the only two oils that wont ruine the engine are ECHO and Stihl 2 Cycle Oil. I have been using Lucas Syn Blend for years. I did a search on that oil and found the Amsoil Study where it had so much build up in an ECHO trimmer only about 40% of the air could still get through. Now I'm wondering if that's why my 4.5 year old Toro trimmer seemed to loose all its power. What should I do with the fuel/oil mix I already have in the fuel can? Any Lawn Pros here that use these new Echo models like the 2620 or 3020?