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Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Lincoln
Satisfied Customers: 48688
Experience:  16 years experience with Lincoln
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Pearl, we own a 2015 Lincoln Mks that has all wheel drive

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Pearl, we own a 2015 Lincoln Mks that has all wheel drive (AWD). We are looking for the tolerance range of the 4 tires on an AWD equipped car. We understand that need to be close in circumference so the AWD control system is not always trying to apply power to a particular wheel because it thinks it is going slower due to tire circumference or diameter. We also understand that this puts the differential in a constant slip mode because one tire is rotating faster or slower that the other on the same axel. We understand that this is normal for turning while in motion. This assumes that all 4 tires are the same make and size however ... Rt Ft tire tread measures 10/32. The other three tires measure 6/32. That is a 4/32 difference in tread depth. Everything we have found indicates that the maximum tread difference on an AWD equipped car should be 3/32 or less. We are looking for the document tolerance from Ford/Lincoln. Dan Daniels
JA: Have you bought the tires yet?
Customer: No, arguing with the dealer about the tires. This is a CPO Certified car. I want the to replace at least one and I will buy two more.
JA: Are you fixing your MKS yourself? What have you tried so far?
Customer: I am asking for the documented tread depth tolerance from Ford for a AWD car. Not fixing anything yet.
JA: Anything else you want the mechanic to know before I connect you?
Customer: No thanks, ***** ***** my main concern. Appreciate you.
Customer: replied 1 month ago.
If you find this specification. We need to have a copy or know where to find it so we can show it to the Lincoln dealer.

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I can not find anywhere on the Ford info in the repair guides the allowable tolerance. I know from going to all the Ford schools though. You measure the tire circumference with the car off the ground using a nylon tape measure. Comparing all 4 tires the max difference from smallest tire to largest one is 1/4 inch.

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Customer: replied 29 days ago.
I guess I can do the math to translate the 1/4 in in circumference to xx/32 in tread depth. I will take this back to the dealer to see if we get anywhere. I am about to spend $1,200 dollars for tires and my position is that the dealer selling me a CPO unit should pay for some of this. Thanks for your feedback. I could not fine anything either. Regards, Dan

You are welcome