Can I change 1 tire instead of all 4 on my 2008 E350 AWD?
We have a 2008 E350 AWD 4MATIC Sedan. My wife had a flat tire the other day and by the time she realized and pulled over, the tire was ruined. All four are 1 year old Michelin Primacy MXM4. I took it to the shop where I got the tires and have the tire warranty and they're happy to replace the one tire, but they advised me that I could ruin the AWD if I don't change all 4 tires due to the difference in wear between the new and the old. Is that true? Do I have to change all 4 tires? He said something about the difference in wear is about 3/32.
Thanks for the advice.
I run my 4Matic staggered in the summer. As long as you don't go crazy it's not an issue for the 4Matics.... so a little tread difference is not an issue for the differential or anything like that.
If you want to be generous to the jerk, buy one (plus the one he replaces) and put one of the old tires in the trunk as a spare.




If it is noticeably worn you should buy 2
You don't need to buy 4.
Some tire shops have become "pissy" on this point, probably out of an unwarranted fear of being sued.
Worst comes to worst, take the wheels in off the car to get the tires




Depending on how often you replace tires, you might want to think about replacing all 4 just to get and keep the typical 4-tire discount which you will miss out on once you go to replacing in pairs.
So: . . . . .
if less than 1/2 worn buy 2 knowing you will be dumping two not yet worn out on the next 4 tire change.
If more than 1/2 worn consider 4 now.




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Depending on how often you replace tires, you might want to think about replacing all 4 just to get and keep the typical 4-tire discount which you will miss out on once you go to replacing in pairs.
So: . . . . .
if less than 1/2 worn buy 2 knowing you will be dumping two not yet worn out on the next 4 tire change.
If more than 1/2 worn consider 4 now.
...or three for $197: The 'paid for' one, the warrantied one, and the 'leftover old one' that goes in the trunk as a spare.
...or three for $1,200: The 'paid for' one, the warrantied one, and the 'leftover old one' that goes in the trunk AND the new WHEEL to put the tire on



