They can, under the right driving conditions. Just make sure you stick to them all year around.
Some forum members are mentioning quite often and it's getting annoying, that their filled for life transmission has failed because manufacturer didn't specify any servicing. Plenty of sludged up engines out there, law suits in every decade since the 70' only they called it the black death at the start. Prematurely worn out timing chains, cracked pistons in the 1.4TSI twin charger engines. The early 5cyl TDIs were wearing out the camshafts because of 50,000km 2years intervals set in 2004 (were revised down to 20,000km, then todays 15,000km).
Did I forget to mention that many owners of the 5cyl TDIs in US were monitoring the oil and even kept spreadsheets at TDICLUB.COM only to see their engine self-destruct at around 80,000km as a result of not using VW506.01 oil, they thought they new better.
I don't trust the oil samples tests, simply because, they don't see what is inside the oil filter and inside the engine.
Finally, I don't care how often you change your engine (or other) oils.
Something you don't know? Or maybe you just forgot the old mechanics saying "pay me now or pay me later"
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