Why motor oil need detergents?

The main purpose - to prevent the accumulation of impurities and deposits on engine parts exposed to the greatest warming (groove cylinders, exhaust valves, pistons). Effects of detergents helps reduce the formation of carbonaceous deposits and oxygenated compounds, and also prevents the accumulation of dirt and tar deposits on the metal surfaces.

The company Valvoline, using innovative technologies for the production of motor oils, focuses on the presence of additives such as these depends on the "longevity" of your motor.