There exists an oil pump in every vehicle that pumps the right amount of oil into the engine. The oil pump is sealed by a stuff made of rubber known as O-ring. O-ring seals are highly prone to failure. The pattern of failure varies depending on the cause. Extrusion and nibbling- are the primary causes of failure of O-ring, especially in dynamic applications. Manufacturers have to use good design practices and motorists have to use the right O-ring during the replacement by checking the compatibility with system fluid- in order to maximize the seal life.