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The wear of different car parts is affected by a variety of external factors. Mechanical wear takes the greatest toll of moving surfaces. Minute as the particles which wear away are, in their total they are the essential factor which causes the surface structure, the original dimensions and the shape of the parts to change gradually. Moving parts are not the only ones to deteriorate from mechanical wear: stationary parts, such as connections by threads, wedges, slots, etc., also suffer heavily.