I have a question. Why is that when our engines were new they seemed to last longer than ones that have been rebuilt? Even when you do it right! What did the factory engine assemblers do that was so magic? We have some of the best engine builders in the world on this site using some of the best parts in the world. Yet if I bought an engine from you, it would be a great engine, but I don’t think it would last 20 years like the ones did from the factory. Can anyone explain why this is? What technically causes this?