I just want to add one thing.
I emailed Subaru a while back asking about synthetic diff fluids. They recommend the fluid they use simply because it's what they tested. The other fluids just haven't been tested.
Personally, I believe that synthetics are often superior to dino fluids. Obviously, care has to be taken so that an incorrect fluid is installed (too slippery or too thick), but I think there are enough people out there that have driven many miles on synthetics that I have no problems using that when my maintenance date arrives.
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