The good ones should last the life of the engine, provided oil changes are done frequently enough and the correct oil used. Pot luck which one was built into any particular engine during assembly. Other chains were manufactured properly and were fine. So as they were subject to wear and stretch in use, they soon developed rattles prematurely. Which meant that some chains started life already near maximum wear tolerances. The chain manufacturer used by VW was forced, by the price paid by VW, to extend the life of those). (The Hood has the full story - to do with the manufacturing dies used to stamp the chain links and pins. Some but not all, early chains used suffered slightly from manufacturing economies that led to premature wear and stretching.
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