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ASTM-d130 is a test for evaluation of lubricant additives tendancy to corrode yellow metals. Yellow metal corrosion has become a more critical factor as the EP additives in gear oils have become more concentrated. Older gearboxes with yellow parts (brass, bronze, copper) synchros, and other parts will be damaged by high additive content in some new oils. The ASTM-d130 test rates oils by imersing a prepared copper strip in the lubricant at 2 temperatures in the range typical of the gearbox in service (212 degrees, and 250 degrees F). The ratings go from a "1a" with slight discoloration, but barely noticeable, to a "4c" which is severely corroded, blackened, and pitted. Use care with older gearboxes and highly corrosive oils.

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