"Under normal operating conditions, CV joints and boots are engineered to last upwards of 150,000 miles. Some go the distance, but a lot reach the end of the road far short of their design life. According to one major aftermarket supplier of replacement axle shafts, CV joint shafts are typically being replaced at anywhere from 70,000 miles to 130,000 miles. What's more, some makes and models of vehicles are notorious for eating shafts. Subaru, according to this source, is one vehicle that has a higher-than-normal replacement rate. The aftermarket supplier we talked to blamed the problem on the relatively thin case hardening that Subaru uses in their CV joints."Article here.
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