By all accounts, Tesla has been a major success. It's sold nearly 100,000 units of its Model S sedan, has a Model X SUV on the way, and despite overblown reports that it loses money on every car sold, it shows no signs of going bankrupt any time soon. In the world of automotive startups, no other company has come close to that kind of success.

But one of the biggest criticisms Tesla has faced is about its long-term reliability. Consumer Reports even went so far as to remove the Model S from its list of recommended vehicles. According to a new analysis of survey data from Plug-In America, it may even be worse than we thought. Two-thirds of early Model S drivetrains may need to be replaced before they hit 60,000 miles.

Green Car Reports conducted the analysis of the survey data, looking into long-term reliability of a total of 327 Model S sedans. Its conclusion is that 2012 and 2013 models face a serious reliability risk.

Tesla offers an eight-year warranty that will cover these issues, but it's concerning to see early models with failure rates nearly ten-times that of later models.

When asked for comment, Tesla didn't answer any direct questions but did respond with a general comment about the company's increasing reliability and strong customer satisfaction.

Check out Green Car Reports' analysis here.

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