Thermally Stable Automotive Lubricant Oil is specially formulated for use in high powered air cooled two stroke cycles engine used in chain saws, law mowers, heavy duty motor cycle and one or two cylinder small outboard engines. The Lubricant Oil can be used in the engines where oil is mixed with petrol or a separate injector is provided for mixing. The Lubricant Oil has high thermal stability and gives low heat generation and less frictional power losses. Thermally Stable Automotive Lubricant Oil has good resistance to oxidation to keep the engine free from carbon deposit and gives trouble free ignition to provide longer spark plug life.