Higher oil temperatures lead to greater evaporation, more oxidation, more deposits and shorter engine life. If the oil thickens, greater wear will occur on starting. The oil's anti-wear additives will be used to fight oxidation, rather than prevent wear. An additive package aids in improving the oil's life. Remember, nothing lasts forever.
Additives are like the oil they help - they have a limited life.
Reduce friction losses throughout the engine for more power and better fuel mileage. Fight the rust and wear caused by acids and moisture. They protect vital steel or iron parts from rust, and corrosion of other metals. These additives reduce thickening of the oil, and sludge formation. These additives limit bubble growth and break them up quickly.