I have a 2002 Explorer with an independent rear differential. I replaced the original fluid with Supertech 75W-140. Now I get a little gear while. It's not super loud, but it's noticeable now.
Even tho the grade is the same on paper, do you think a name brand would eliminate the whine? Valvoline SynPower, Mobil-1 and Royal Purple Max Gear are readily available where I live. These all have the friction modifier already in the bottle. I had to add a bottle of the Ford XL-3 with the Supertech.
Any advice would be appreciated.
Even tho the grade is the same on paper, do you think a name brand would eliminate the whine? Valvoline SynPower, Mobil-1 and Royal Purple Max Gear are readily available where I live. These all have the friction modifier already in the bottle. I had to add a bottle of the Ford XL-3 with the Supertech.
Any advice would be appreciated.