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Originally Posted by FSETH
The difference between us is that I do think there is a downside to changing the fluid for the first time at higher mileage,
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That's fine. I do not. And without evidence to the contrary it will remain an urban legend in my mind.
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so does JCL, who not only has personal experience working on transmissions, but also has extensive knowledge in lubrication and mechanical engineering, etc. Also, don't forget about Weasel (current tech at a BMW dealer as well as prior trans shop work), motordavid (family member is AAmco owner), and others...
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I've spoken to my mechanic, who has 25 years repairing BMWs, about this issue. He doesn't feel there is any risk to changing the fluid. And he has done it many, many times.
Even JCL has qualified the risk as
slight.
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I have actually heard of shops/dealers baulking on changing the trans fluid even when the owner was ready and willing to pay for the service. It seems like some of these places don't even want to touch the trans incase something happens after the fluid change. That way the owner can't blame the shop for the failure.
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That is their right. I'm not surprised to hear there are some shops which believe this urban legend.