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Message: <blockquote data-quote="swshawaii" data-source="post: 1040965" data-attributes="member: 67547">After reading the Ford TSB I had the same question for my 2005 with a 3:73 open differential. No towing or heavy use for me either. Never had whine and don't believe the MPG savings would be that significant with lighter gear lube. Still chose to use Amsoil Severe Gear 75W-90. After 30,000 miles no regrets and the only thing I hear is tire and wind noise at highway speeds. IMO, use the 75W-90 Mobil 1 you already have with added friction modifier even though you have an open diffy. Mobil  1 says it's compatible for open axles and many other open axle owners use it.[URL unfurl="true"]https://www.explorerforum.com/forums/threads/tsb-05-12-6-2002-explorer-rear-end-whine.157872/[/URL]Note Amsoil lists 75W-90 and 75W-110, not 75W-140 in their fitment guide for Gen 1 Tracs.[URL unfurl="true"]https://www.amsoil.com/lookup/auto-and-light-truck/[/URL]</blockquote>