The oil expense is connected by that it at engine work partially arrives in the chamber of combustion and there burns down with a working mix. Oil in the combustion chamber can arrive through defective маслосъемные the caps, the worn out piston rings, too big backlash between pistons and mirrors of cylinders or too big backlash between the directing plug of the valve and its core. If the engine of your car is technically serviceable, during the regulated intervals of replacement of oil to you, probably, it is necessary to add a small amount of oil (0,25-0,5). This rule extends and on diesel engines provided that you regularly change oil, and your engine is not exposed to excessive loadings because of sports style of driving.