Good. Not surprise there is no record because MB says they don't need service which as far as I am concerned is nonsense. While maybe less demanding service and long life, changing it can be as important if for no other reason to see what is in the pan but new oil is good to do.
As a retired Auto Transmission specialist I fully agree with this statement !!
There is no such thing as "Lifetime Oil" etc ...................
You see, to the likes of MB and BMW etc their idea of "Lifetime" is 100k Miles
I regularly used to see these transmissions destroyed at 100k to 150k miles, but the ones that we had religiously changed Fluid Filter and Connector Bushing at 80k mile intervals all went to at least 300k miles.
2 of these were hard working Vito Minibuses, "twins" with 1 number different on the VIN, both ordered and built at the same time for a local fleet owner.
I finally stripped and rebuilt them at 330k miles due to a Coverter L/Up Shudder, the actual Transmissions guts were like new, I simply changed all seals, sprags and clutches as a matter of course, also replaced the Lock Up Valve in the Valve Block with the Sonnax kit (this valve wears at very high miles), and fitted a new Converter ................. They are now at around 500 k miles and still going strong
HTH, Cheers Dave