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Just about everything GTJim stated is correct. The only thing I would add is that the copper strip test mentioned is also conducted under a controlled amount of moisture present and a specific time. (to let the moisture react with the sulfur) The only reason I say this is if you change your oil yearly I don't think the corrosion will be an issue. So if you have GL5 oil in your trans don't panic thinking it has to be replaced this instant.
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