Why the engine parts get weared,although the recommended oil is used with regular changes?
In a theoretical, perfect world, engine parts coated and replenished with a clean film of oil under pressure would never wear out. Of course, this would necessarily depend on the metal surfaces being perfectly machined 100% smooth and the same for the mating surfaces that they ride against – and the clearances would also have to be consistent and perfect. The key word here is “perfect” – and in the real world, it’s not going to happen. In answer to your question, it’s vitally important for long engine life to keep it filled with a clean supply of a good quality oil. When one considers the internal workings of a typical engine, the various operating conditions and temperatures – it’s really incredible that they last so long as they do.
