Unlike the nitro engines you’ve used in the past, the Savage XL Octane runs off a mixture of normal pump gasoline (petrol) and 2 stroke engine oil. It is recommended you use regular gasoline as high octane race fuel will not add power and will actually make the engine harder to start. Use good quality 2 stroke (aka 2 cycle) engine oil. You can find this oil at your local small engine shop, motorcycle dealer or hobby shop. Mix your gasoline and oil in a separate container at a ratio of 25:1, that is 25 parts gasoline to 1 part oil.