Come to think about it, There are a lot of praises on Both synthetic and dino cheap oil. BUT I heard quite a few complains on those synthetic blend oils like Shindaiwa One, Echo Power Blend etc. I personally do not like Shindy One. My blower did not run smooth and smelled really bad. I did not even finish the 6 pack and I gave it away to my friend. Echo was ok until I switch to Amsoil. Smells ok and stuff ran smooth. I used it for about 5 months with no ill effect. I personally don't have anything bad to say about the Echo oil.