Gear Oil Question

Discussion in '2005 - 2009 Specific Tech' started by jasongt06, Jun 11, 2008.

  1. jasongt06 New Member

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    Why did Ford change from using 75w90 gear oil in the 8.8 to now using 75w140 in it? Wouldn't 75w90 return better economy and performance?
    jasongt06, Jun 11, 2008
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  2. Fourth Horseman New Member

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    Just a guess here, but better wear protection over a wider range of operating temperatures? I've been running 75w140 in both of my cars (my Marauder had 75w90 from the factory, not sure about my Stang) and haven't noticed any obvious difference in gas mileage, though I'm sure in theory there must be some.
    Fourth Horseman, Jun 11, 2008
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  3. NastyStang113 New Member

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    The difference in gas mileage.
    NastyStang113, Jun 11, 2008
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