A recommended practice would be to have them inspected every time you change your oil assuming you change your oil on a regular basis (3 months or 3,000 miles). A CV boot should last a minimum of 40,000 miles providing it has not been damaged.
•Any signs of leaking grease should be taken care of as soon as possible. One of the main causes of failure in CV boots is road grime collected from normal driving conditions. Road grime is abrasive and eats into the material of the CV boot, over time it cuts like a knife leaving your CV joints exposed to the elements.

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