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Q: Which rear differential oil is currently recommended for 9.75 inch standard diff on 2001 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
originally, Ford recommended 75W-140 synthetic. My Ford Master Tech. Friend says it is better to use 80W-90 regular diff. Oil because 75W-140 gets too thin in use. Have you heard of this? Which do you recommend?
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