Oil additives are chemical compounds added to lubricating oils to enhance their performance and protect engine components. They serve various functions, such as reducing friction, preventing wear, and improving the oil's ability to withstand high temperatures. Common types of oil additives include detergents, dispersants, and anti-wear agents. These additives help maintain engine cleanliness by preventing sludge buildup and ensuring smooth operation. They also improve the oil's viscosity, allowing it to flow better under different temperature conditions. Overall, oil additives play a crucial role in extending the life of engines and improving their efficiency.