I have a 2013 135is with DCT that I bought with 34,xxx on the clock. I am now at 102,xxx miles and I have yet to change the transmission fluid. Shifts are smooth and crisp and I have no issues with the DCT as of yet.
When I bring my car in for an oil change I will inquire with my SA and see if there are any leaks or anything obvious in that area that need to be addressed.
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