i used to always run omega but the hobby shop i get stuff at said he was going to try to phase out the omega and try to only sell cool power. they are the same company i think but the cool power is synthetic. truth be told i have more power it feels like with cool power if i can get it tuned right but the omega seems to run cooler and make engines last a little longer. i never had engine problems until i swiched to cool power. one engine i had went 2 years on omega and 1 on cool power. then started losing power. just worn out. if i can get an engine to last me 2 years i'm doing real good. my planes and engines have hard lives.