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



Dwightoutdoors, 5.4L V8, Issaquah, WA, September 27, 2013, 14:30

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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