Most karts are powered by two-stroke engines, which don't run on "unleaded" gas from regular road-side stations, but on "fuel blend". As the name implies, this means a blend of gasoline and... oil. Now why is this? Well, two-stroke engines don't have a lubrication circuit, therfore oil is added directly to the combustion chamber, so it may lubricate all moving engine components before burning out. Therefore, the use of oil is fundamental for a kart and, consequently it is essential to to have basic knowledge about the products: basic information and a few practical tips can only help all kart drivers to chose the best oil for their engines and use it properly.