Briton 2 Stroke Engine Oil is fully synthetic oil for two stroke engines, for either pre-mix into the fuel or used in separate lubrication systems. It can be used in all two stroke engines such as motorcycles, chain swas, lawn mowers, quads, and boat outboard. A 1:50 ratio is recommended but manufacturer’s recommendations must always be followed. Briton 2T is low ash, low smoke formulation which residue free when burnt.