Audi A8 quattro Tyre Change Question - Confused

[IATM8701]

Hi Guys, Need your help, why is it that you need the same tyres on an audi a8 quattro (3.0 tdi 2006). I keep reading this but no proper reason why. I have seen a audi a8 i really like, one owner (age:50) nice example. only 35k on clock. serviced by audi its whole life however:

The front tyres have (Pirelli)6mm each... the rear tyres have 4.5 -5mm(Dunlop) ...

is this a ba thing or are people making a bigger deal about it than it is.

if you could provide any info that would be great.

Cheers

[IATM8701]

Thanks for the reply guys

ukdennis: so how does this affect the car. To my understanding that means one axle could be going faster/slower than the other however does it damage any of the quattro system. Does the system have some tolerance for this?

[IATM8701]

That's great. Thanks guys. I'll all honesty. If I buy the car I will probably buy a set of two tyres with same mm tread so that they all do match. Rather be safe than sorry but I just wanted to make sure that the damage was not already there by the previous owner having the difference.

Thanks again.

[IATM8701]

That's great. Thanks guys. I'll all honesty. If I buy the car I will probably buy a set of two tyres with same mm tread so that they all do match. Rather be safe than sorry but I just wanted to make sure that the damage was not already there by the previous owner having the difference.

Thanks again.

[IATM8701]

Hi Blueg33,

That is very interesting! see this is the trouble I have there seems to be two extreme views on this however audi dont really give a 100% straight forward answer as to why.

I have heard of people who have had one tyre punture and due to this have changed all four tyres and kept three spare or sold them off however this seems extreme.

Wish we could have a stright forward answer with a logical reason.

[IATM8701]

Maybe they don't say it because they know people would realize it's utter garbage?

[IATM8701]

Jason what do u mean by they should be done in paris.

Any Audi techies out there that can actually explain if firstly this rule of all four tyres must be the exact same and if so the reason why.

As mentioned earlier in this post even 4 new tyres would wear differently with a different of 1-2 mm different rear/front.

I understand if Audi said it diddnt affect longevity of the vehicle but it greatly affects how the car handles on regards to grip but I genuinely don't believe Audi openly says there car is made with wo much precision that if the tyres are 1-2mm out or front of pirellis and backs have dunlops your car is on the path to dome. They are both similar tyres etc etc have the same effect. Now I'm not saying oooo they are a v v close match but it's not to the point one set are slicks and the other axle have studs.