Had some extra time on my hands and decided to change my rear end oil on my 2011 V-6 with 3.31 ratio. It has 7,500 miles. The owners manual says the V-6 rear end holds 1.5L and the G.T. holds 2.0L. This isn't true, my V-6 held 4oz of friction modifier plus 2 1/3 quarts of 75W-140 rear axle lub. I used the factory Motorcraft synthetic axle lub i bought from my dealer.

The old oil was grayish black and you could see little sparkles of brass in the sunlight. The magnetic fill plug had a lot of fine metal particles stuck to it.

Its easy to do. You can go to youtube and search, how to change rear end oil.

 

is this recommended or necessary/good to do??

 

The updated owners manual that you can download has the correct gear oil quantity listed.

And has the quantity showing the same on both GT and V6.

 

GT takes 2.7 quarts of 75w140.