Quote:
Originally Posted by sunny5280
Why would I change my mind when the facts haven't changed? The facts are there is not supporting data for this theory. I've requested it numerous times and each time it has never been provided. Anecdotal stories, and that's what they are, posted on a forum is not supporting data. Not trying to be a jerk about this but I have a mechanic with over 25+ years experience working at a BMW dealership in various service capacities who tells me otherwise.
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No one has asked for you to change your mind and no one is trying to convince you otherwise. Your opinion is your opinion and you are welcome to it. From what FORUM readers and FORUM techs have said, yes, doing a tranny fluid change on a worked out tranny heightens the risk of transmission damage. For your tech with 25+ years experience to tell you other wise is completely fine. But I will reverse your logic. You coming to the forum and telling us there is no substantial data to support the theory that a fluid change could possibly result in a failed tranny and that you have never seen supporting data is fine. Techs with years of experience have mentioned that this is possible and is a relevant concern. But... we haven't seen any data you have provided from your tech with 25+ years experience that proves the complete opposite. Supporting date could be an excel sheet listing all of the trannys he has done a fluid change on and how many have come back to thank him after another 50K, 75K, 100K miles of service and do another fluid change.
The point JCL and I were trying to make was, it IS possible to damage a transmission by doing a fluid exchange. We have seen it happen on the forum and I am sure JCL has seen it during his career personally. The statements you have made pertaining to your tech sound like absolute statements (Fluid changes do not cause transmission failures). And if your tech is saying that, then fine, we would actually love to hear that because it would stop the madness about doing and not doing a change of fluid and will give us a definitive answer. But until you can prove it, then its all relevant. There are forum members that have done a fluid change without any problems. Some have even used fluid that isn't even the spec it calls for and they are still fine. Bust some have had the service done at their shop or at the dealer and they have come back with a trashed tranny.
On another note, thats great your tech has had numerous roles, is a shop owner, and is 25+ years in. Thats really great and is probably a wealth of knowledge. But in my honest opinion... the power of the forum is better than any tech on his own. A forum is a collaboration of tried and true methods, fixes, and symptom hunting. I mean there have been countless times when members have come to the forum describing a symptom that their tech or dealer couldn't figure out, and 9 times out of 10 we've come up with the right solution. There is information on here that some dealerships haven't even heard of, "i.e. TSB numbers, tricks, tips, etc" Heck, members have even designed and manufactured their own parts that are better than original. So before regarding information on forums as mere heresay, you might want to add in your own "one hitter quitter" to back up your own claim. JCL and I have seen it many times on the forum here. We've witnessed heated arguments going back and forth between the advantages, disadvantages, turmoils, which fluid to use, etc. Information that you mentioned you have seen. Well, we haven't seen any of yours...
Again, not going meaning this to challenge you, or get into an argument, or the flame each other. But... just sayin...