I don't know if this is the case with Subaru, but using old and new
tires on the earlier Volvo AWD system could cause serious damage to the
AWD unit.
I would get all new tires because you will reduce the wear on your AWD
system and notice a much better ride. After getting 4 new tires have a
full alignment done. Finally, rotate those tires every 5,000 miles.
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