Glow fuel
Glow fuel is not difficult to make, but some of the ingredients are dangerous in large amounts.  Instead, most modelers buy their glow fuel already made.  Some very small engines require more oil than larger engines.  More oil may be needed in the fuel.  The proper oil can be found at a hobby shop.  Companies which make glow fuel mix their fuels with the help of computers.  This helps each batch of fuel be of the highest quality it can be.