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which is not specific to just shock proof. Interesting thread: [ http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=503521 ] "GL-5; Specified for hypoid gear service but with shock loads and severe service operation. Usually meets Mil-L-2105D and in most cases, is the multipurpose automotive gear oil. Most 75W90 to 75W140 grades meet the GL-5 classification. This grade has a high level of Extreme-Pressure additives that could be mildly corrosive to nonferrous parts, such as brass, bronze and aluminum parts. Most of the modern GL-5 lubes contain metal deactivators that prevents attacks by the extreme-pressure additives. In addition to EP additives, these lubes contain rust inhibitors, defoamants, friction modifiers, thickeners, and Viscosity Index Improvers. " So...I'm inclined to think that if a lube manufacturer says it is safe for use in synchronized transmissions, either their EP package is not harmful to yellow metals, or there other additives included to protect yellow metals.
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