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2011 supplement , states

 Front axle lubricant------ 80W-90 premium rear axle lubricant

 Rear axle lubricant------- 75W-140, high performance synthetic lubricant.

 Rear axle fluid friction modifier-- 4 oz,

  So we are  still at a stand still, no where does it say , to use it or not, all the fluid weights,  and amouts, but nothing else.


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