This is not just a Subaru issue but holds true for any AWD vehicle. The general rule of thumb is that the tires need to be within 4/32 of an inch of each other, any more of a variation and you need to replace all 4 tires. A variation in tread depth causes a variation in diameter of the tire and will cause the transfer case to fail. Just a quirk with AWD vehicles. I don't know if Subaru is more sensitive than other vehicles.
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