Why does engine oil need to be changed?
Actually oil does not “wear out” – in fact, it can be recycled and reused again and again. What does wear out – or get used up – is the additive package that’s mixed into oil when it is manufactured and bottled. Most modern motor oils are formulated from various base stock oils, which include both conventional and synthetic oils, and an additive package. The additives include detergents, viscosity modifiers, friction modifiers, seal additives, anti-oxidants, anti-wear agents, and corrosion inhibitor and pour depressants and help keep internal engine parts clean and free of sludge, carbon deposits and varnish. Once these additives are used up, there is no longer anything to keep the gunk at bay. And while the oil itself is not used up, it eventually maxes out its ability to hold contaminants and dirt particles in suspension – away from moving parts. That means increased friction and accelerated wear and tear on engine components.
