Originally Posted by newbiefrenchie
Is that why one of the Benz shops said after 2010 C300 didn't need to have the service done at all? Argh, so confusing!
Originally the 722.6 5-sp was "sealed for life". No fluid changes required, ever.
After they serviced a few, they found they all had tiny metal fragments in the pan. These fragments didn't get removed after initial machining, cleaning, and run-in at the factory. The recommendation then changed to fluid change and pan clean-out at the 3rd routine 13k service (in the USA, at 39 k miles), to be done once only. They also added a magnet to the pan, to catch these fragments.
Once-only trans service seems reasonable. Fluid changes every 60-100 k miles hasn't been proved to benefit anyone other than dealer's workshops and indie mechanic's balance sheets. Fluid changes every 40 k can only be bad for the environment and your hip pocket. Then there are some people who change their oil every 5 k.