It's all to do with variables - construction tolerances and flaws, bedding in processes, oils used, environment, quality of fuel used, etc etc etc.
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By 04 the ring drama was already dealt with. But i also agree with the other variables, i saw what destruction poor oil and extended change periods do to an engine last night, nice flat cam lobes, car running rubbish, no amount of tuning, new leads and plugs will ever fix that.
Jmac
Most times when you do the oil consumption test its fine, when the top-up is done at 1000KM after checking the oil, its usually only used about 0.1-0.3L of oil which is well in spec. As Jmac states they are just thursty for oil and there aren't many around now that have the ring issues, just a few when they first came out years ago, think Ive actually only seen 1 car with a genuine oil usage over 1 litre before back in 1998!.... .VW........