I have not ever had a 4matic before.

Is it worth replacing the axle shaft boots with everything exposed? They are not split or anything just a little dirty.

What's the norm? I have 108k on the car.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k