I found on TireRack.com that when you get to 4/32in, .125in, 3.175mm you should start looking to replace your tires. If you reach 2/32in, .0625in, 1.587mm you should replace them.
The dealership said, after rotating my tires, that it is time for me to replace them. I have 4,5,8/32. The 8/32 is a replaced tire. So I am going to make one more trip and then replace them.
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