Replace all tires for a flat one?

If you look at tirerack.com they actually offer a "tire shaving service."
Check out:
http://www.tirerack.com/tires/tirete....jsp?techid=18

"The Model Hobbit" > wrote in message
news:0hh3g.4851$9c6.4597@dukeread11...
> All vehicles with computer controlled AWD must have all tires replaced at
> the same time. As discussed before, the newer tire will have a greater
> diameter and circumference and will in turn spin at a lesser rate than the
> other three tires. Greater diameter means less revs per mile. This will be
> interpreted as wheel spin by the computer and will engage the
> differentials. This will burn out the clutches in the diffs.
>
> There have been a lot of vehicles coming in for service that requires the
> replacement of the differentials. This is due to the computer keeping them
> engaged all the time and burning them out. This is why they are telling
> you to replace all four tires. He will note this in your maintenance log
> in the computer. If the vehicle comes in at a later date with burned out
> clutches in the diffs then they can and will deny you warranty coverage
> because it was not caused by normal wear and tear. You were advised and
> then failed to take the advice of the service technician.
>
> I have read all these horror stories on the Audi and VW forums. The
> Quattro AWD system has a service note in the manual informing the owner of
> this.
>

Interesting article, makes sense to me.

On Wed, 2 Aug 2006 15:13:11 -0500, "Captain Coleman"
> wrote:

>If you look at tirerack.com they actually offer a "tire shaving service."
>Check out:
>http://www.tirerack.com/tires/tirete....jsp?techid=18
>
>"The Model Hobbit" > wrote in message
>news:0hh3g.4851$9c6.4597@dukeread11...
>> All vehicles with computer controlled AWD must have all tires replaced at
>> the same time. As discussed before, the newer tire will have a greater
>> diameter and circumference and will in turn spin at a lesser rate than the
>> other three tires. Greater diameter means less revs per mile. This will be
>> interpreted as wheel spin by the computer and will engage the
>> differentials. This will burn out the clutches in the diffs.
>>
>> There have been a lot of vehicles coming in for service that requires the
>> replacement of the differentials. This is due to the computer keeping them
>> engaged all the time and burning them out. This is why they are telling
>> you to replace all four tires. He will note this in your maintenance log
>> in the computer. If the vehicle comes in at a later date with burned out
>> clutches in the diffs then they can and will deny you warranty coverage
>> because it was not caused by normal wear and tear. You were advised and
>> then failed to take the advice of the service technician.
>>
>> I have read all these horror stories on the Audi and VW forums. The
>> Quattro AWD system has a service note in the manual informing the owner of
>> this.
>>
>