我刚刚发表在GG论坛上的，觉得PP的车友也可以参考一下，感觉有道理可以加点分^_^
  Cyl #2's piston ring was supposedly stamped wrong, and therefore installed upside down in the assembly plant. That's the supposed cause of the big AEG oil consumption problem. VWOA will never admit it, because as it stands right now there's plausible deniability. Right now, you can't prove the oil consumption problem without tearing the engine apart... and by the time you do that, you have already done the expensive part of fixing it. In the end, I think this will lead to a class action lawsuit when more of the defective engines get pulled apart.
简单翻译：发动机第二缸的活塞环的冲压工艺有问题，导致装配工厂有混淆的零件，这可能是2.0发动机烧机油的最主要原因。但是VW是不会承认的，因为所有的参数都标准化了。但你们又没有拆下来的有问题的零件，如果你这样做，那你还要花费很贵的价格去修好它.....
非常技术的讨论和修复请参考：*****

不要咬文嚼字了，这是中国人最容易犯的错误，机油消耗多了不就是烧机油嘛！VW的8V的2.0发动机全球就一种，只是布置方式不一样。怎么会跟压缩比有关呢，1.8 20V的压缩比更大啊，从没听说要补加机油的。呵呵....有问题就是有问题，关键是有问题还不改。
信息只是供参考，感兴趣的DX自己去看，不用钻牛角尖，本贴本人不再回复了。