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Originally Posted by FSETH
Well, with all due respect, when you say "there is no proof showing a correlation between transmission fluid changes and subsequent transmission failures. And that such a claim is nothing but an urban legend.". That sure makes it sounds as though because you have no proof, you don't think there is a risk and it is an urban legend. Do you see how it comes across that way? How else should one interpret what I quoted you on? I am really trying here, but read what you wrote and see if you can understand what I am talking about.
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I don't think you're trying at all. To go back to my oil change example. If I were to say changing your oil results in a stripped oil pan would you or would you not agree with that statement? Please explain why.
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I know you are looking for diffinitive, written in stone proof and I don't really know how I can provide you with that. What I have done is provide you with factual info where BMWCCA's head tech guru has stated that he has personally seen this exact situation happen all too many times. He even gives his thoughts on why this happens. Yes, he does say he would probably chance it and change the fluid in his own car, but if you read the entire article, you can tell that the decision didn't come easy. It does seem like he did some hand wringing over the decision and this leads me to believe the risk is much greater than you are giving it credit for. Well beyond the percentage of urban legend.
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I am looking for more than anecdotes. I am looking for something along the lines of:
Out of 100,000 transmissions where the fluid was changed 10,000 of them exhibited a failure. Compare this with 100 (per 100,000) that failed where the fuild was not changed.
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So, to sum up; I am basing my info, which I have shared with you, on someone who has years of experience working on cars, is trusted by the BMWCCA, Bimmer Magazine and European Car magazine to feild technical questions and help diagnose problems, etc., other actual members posting in this thread as well as another long-term member who happens to be a tech at a BMW dealer and you are basing your opinions on some mechanic that none of us have ever heard of and that you have failed to prove actually exists. Am I missing something here?
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I am basing my information on my mechanic who has 25 years servicing BMW's who states he has observed no increased failures as the result of fluid changes. I am also basing it on the manufacturers recommendation to change it at 100K miles. I am also basing it on my phone calls today to three BMW dealers inquiring into a transmission fluid flush. None of which were reluctant to perform the work. In addition I am partially basing it on both JCL and Mr. Millers statement that the risk is slight (JCLs exact qualifier). And finally I am basing it the complete lack of any supporting evidence. I will remind you the person making a claim ha the burden of proof.