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<blockquote data-quote="fabianyee" data-source="post: 167219" data-attributes="member: 6">There was a discussion on the &#039;lifetime&#039; oil in overseas forum and apparently ZF denied ever endorsed that it can last a lifetime. No oil can last a lifetime, oil can break down on the long run. Anyway, the word lifetime is indeed misleading. if it&#039;s the gearbox&#039;s lifetime, how long is lifetime for the gearbox, 5 years, 10 years??? or 200k km? 300k km??as for the &quot;if you haven&#039;t change your oil don&#039;t do it, but if you already start changing you must stick to certain schedule&quot; theory. I would say it stemmed from the idea that if you flushed an &#039;overdue&#039; gearbox, it may dislodge gunk inside the gearbox. and depending on how big are the dislodged gunks, it may get stuck inside the gearbox and not flushed out. And these &#039;floating&#039; impurities may clogged up passageways causing havoc.So the theory is that, flushed before the gearbox gets too gunked up inside, or let it stay stuck inside undisturbed.</blockquote>

[QUOTE="fabianyee, post: 167219, member: 6"] There was a discussion on the 'lifetime' oil in overseas forum and apparently ZF denied ever endorsed that it can last a lifetime. No oil can last a lifetime, oil can break down on the long run. Anyway, the word lifetime is indeed misleading. if it's the gearbox's lifetime, how long is lifetime for the gearbox, 5 years, 10 years??? or 200k km? 300k km?? as for the "if you haven't change your oil don't do it, but if you already start changing you must stick to certain schedule" theory. I would say it stemmed from the idea that if you flushed an 'overdue' gearbox, it may dislodge gunk inside the gearbox. and depending on how big are the dislodged gunks, it may get stuck inside the gearbox and not flushed out. And these 'floating' impurities may clogged up passageways causing havoc. So the theory is that, flushed before the gearbox gets too gunked up inside, or let it stay stuck inside undisturbed. [/QUOTE]

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