David Einhorn was recently eager to slamChipotle ( CMG) and Green Mountain Coffee Roasters ( GMCR). However, he has not backed away from his investment thesis on General Motors ( GM), the third-biggest holding in his Greenlight Capital fund. GM went public in 2010 after the auto crisis stemming from the 2008-to-2009 recession, and Einhorn thinks the highly leveraged company stands to benefit from increased demand domestically and rising sales in China and Europe -- all of which are contentious predictions. Einhorn, the president of Greenlight -- which has some $8 billion in assets under management -- is famous for his prophetic anticipation of the Lehman Brothers collapse in 2008. Aside from the GM stake, valued at $344 million as of June 30, Greenlight's top holdings include Apple ( AAPL) and Seagate Technologies ( STX), per the fund's 13-F SEC filing. For the second quarter, General Motors surprised analysts by reporting earnings per shares of $0.90, beating the consensus estimate by $0.11. But, while the company gave reason for hope in its bottom-line figures, it still reported revenue of $37.6 billion, falling short of estimates by about $1 billion. Indeed, in this economic climate, the trend for many different companies involves less and less room for bottom-line growth and sluggish sales. At the Wednesday's Value Investing Conference in New York, Einhorn said GM expects its international operations to improve, and Einhorn foresees a pick-up in domestic auto sales as well. There is indeed some cause for optimism in regard to both. According to a Scotiabank's Global Auto Report, vehicle sales increased 8% year over year in both July and August. Purchase volume in China also rose 11% -- a significantly higher rate than that of the rest of the international car market. There has been a fair amount of skepticism, however, about whether GM and Ford ( F) can increase their market share in China (and in Europe), since lighter-sized cars are by far the most popular type in China. Of course, this all depends on execution in both companies in that segment. Einhorn also said at his investor meeting in May that GM is a "misunderstood and very cheap stock." We have previously voiced concern about GM's pensions, which were 88% funded in 2011 -- that is, underfunded by about $25.4 billion. This is weighing the stock down, along with the fact that shares are still being held by the U.S. Treasury.