do u know wht type of covering was used. for an example monokote, towerkote, whtever sig makes kote, ultrakote. All those i know for a fact are fuel proof. wht other type of fuel are used?i did not know that nitro engines could not use nitro. the reason nitro is used is becuase of the fuel ignition point is at the right point. also like 20% oil is usually used to lubricate internal engine parts.