I bought the Infrared thermometer based on a couple of other posts. I don't know how accurate it was. Pan is steel and it is painted black. I think that
the transmission must have some tolerance. If not then why is are there two marks defining 80 degrees centigrade on the factory dipstick tool.

I drove it 10 miles and filled it between the marks, but not all the way to the top mark. Logic was 1 liter of cold fluid has some expanding to do. I doubt that most independent MB shops have the special computer that the dealers have to check fluid temperature.

I call it good and suspect it will be just fine.

Steve