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Originally Posted by JSH
European auto manufacturers quote long service intervals because they expect customers will use the correct specialized fluids required to achieve those long service intervals.
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And the downsizing is also a matter of concern, as turbocharged engines tend to be way more sensitive to lower-grade oils than most naturally-aspirated engines were around 20 years ago. Besides turbo-lag which may be quite critical in some regions, to the point of almost neglecting any practical benefit of downsized engines.
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In Europe that isn't a problem - most people actually follow the maintenance schedule. In the USA - a BMW is just as likely to get bulk Jiffy Lube oil as the euro spec oil.
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No wonder Volkswagen retained that 5-cyl 2.5L naturally-aspirated engine for instance, as it was more redneck-proof than the TSI engines fitted to Euro-spec versions of the Golf and the Passat back in the day.