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To be found in our own library...: http://test.steelsoldiers.com/upload/M35/LO9-2320-209-12-1.pdf, on page 3: GO - Lubricating Oil, Gear Multipurpose (MIL-L-2105)
This is equivalent to the API/ GL-4 specs and should still be around, although today most car and truck manufacturers are specifying...