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Ive never seen a good answer to why US cars need 5k changes and EU ones can do 15k+, on same engine, in a world of synthetic oils. It seems to be embedded in US culture. US manuals for the same car will give a different spec to the EU one. Intervals on a UK 340i countdown from 15k / 2 years and vary based on driving.
Google:
"Because for a long time, American engines were crap, sludged up badly, and changing the oil frequently was about the only way to keep them alive. Or, at least, there were enough engines like that to justify the habit. You'll never hurt an engine by changing the oil too frequently (unless you forget to put the oil in or something). Given the cost of a new engine, it generally does make sense to change the oil frequently."
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