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Iowa X3 - I don't know the design of the seal in question, but usually seals in similar applications are two ceramic rings under spring pressure, one stationary and the other spinning against it. On a microscopic level, the seal faces don't actually touch but ride on a thin film of oil. It seems to me that microscopic grit in the oil from combustion and engine wear could act as an abrasive and wear out such a seal.
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