Optimix-30 30% Nitromethane and 20% Synthetic Oil. Supplied in full 5L containers not US Gallon (3.78L) Optimix-30 is designed for advanced competition 3D helicopter and aircraft flyers, also suitable for model cars. Suitable for use on 4-stroke engines where 30% nitromethane is prefered. Very high power outputs for those who demand extreme power. Note Web Price is for box of 4 x 5 liter bottles ex-VAT £117.02