Unlike a passenger car, which has separate lubrication systems to serve the needs of engine and transmission, a 4-stroke motorcycle has a more compact and complex design that relies on the same oil to lubricate engine, clutch and gearbox. This places tremendous stresses on the oil, and demands different performance characteristics compared with oils developed for passenger. This is especially true when it comes to the wet clutch assembly, where the The resistance to motion of one object over another. Friction depends on the smoothness of the contacting surfaces, as well as the force with which they are pressed together. modifiers used in traditional passenger car oils can cause excessive slippage. This compromises the efficiency of power transfer to the transmission system leading to a significant loss of available power and adversely affecting Mobile sources - Pollutant exhaust gases created by the combustion of fuel. Water and CO2 are not included in this category, but CO, NOx, and hydrocarbons are and are thus subject to legislative control. All three are emitted by gasoline engines, while diesel engines also emit particulates that are regulated. Stationary sources - The release of sulfur oxides and particulates from power stations that can be influenced by fuel composition. Local authorities control the sulfur content of heavy fuel oils used in such applications.. In addition, higher engine speeds and higher power densities coupled with compact engine design leads to higher operating temperatures in motorcycles. That’s why dedicated motorcycle oils have become an essential component of a global approach towards controlling emissions.