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Message: <blockquote data-quote="meetoo" data-source="post: 209549" data-attributes="member: 4025">Look, for every post out there which is anti-change, there is one that is pro-change:Depending on the Mileage. Eventhough BMW will say that it is a lifetime fluid, lifetime is 100K miles.I had mine replaced at 96K miles for my old 840 and it did improve the smoothness of shifting.ZF (ZF Friedrichshafen AG) does NOT recommend leaving the fluid in for the "lifetime" of the transmission unless you want a shorter lifetime! I think BMW's definition of "lifetime" is the end of the warranty!ZF is the maker of the transmissions and they don't share the same opinion as BMW???ZF does say now, however, if you have gone over 100K, things probably are worn and deposits have been built up that -may- cause an issue or bring about failure earlier if the fluid is changed after high mileage has been accumulated. They DO recommend changing regularly at around 50K-60K miles interval.So the OEM maker of the transmissions says change, and BMW says don't have to. It depends on who you want to believe. There are also tons and tons of posts saying how problematic BMW gearboxes are.As someone said earlier, if you're gonna change, then change early and regularly. If you're not, better leave it until your gearbox kong completely.Smart programming? Ya, ya, up to you if you want to believe it la! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /></blockquote>

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