I was using Traxxas 20% at first. I have been using Wildcat Eliminator recently. When I first started running it, I had to richen up quite a bit, maybe because it has less oil than the Traxxas? It seems to give me more power and a tank seems to run longer, but that is general impression, nothing scientific. It also seems to smoke more. According to the bottle, it is 14% synthetic/castor blend oil.