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When?
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Taking all this into account, I cannot believe that any transmission is "sealed for life". Parts do wear and contaminants can pass through filters, and if the contaminants do not pass through the filter, the filter will begin to slow the flow of fluid. Then there is the argument why Mercedes had the "sealed for life" transmission in the first place.>>>
What amazes ME is that this discussion persists since MB changed their stance on this about 2006, when they notified their dealers that the "lifetime" fluid is to changed at about 39000 miles. I have seen that document so it is not "something I heard."
Since the 5-speed automatic (electronically controlled) in my at-the-time '01 C320 had no torque converter drain plug, only about half of the fluid could be drained and I settled for that. The dealer offers a trans flush for a huge price but I declined.
My 2008 C300's 7-speed auto HAS a TC drain plug and I will be changing it's fluid at about 39K miles which is a long way off.
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Roger E.
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