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I am currently having the short block replaced via Subaru. After researching much of the information available, I am suspecting that the materials used to manufacture these engines is what the source of the problems are. Using a "recycled" material, instead of new in metals, often results in a lower quality material. Mixing together a lot of different metals such as aluminum, iron, cast etc. Also, using plastics in a high temperature application, such as the engines internal components, will lead to a problem. Many of today's so called " new" cars are produced with recycled materials.