Yes you just show up at the dealer and they submit a form and you get your award in the mail. It's a grill badge and a certificate.

250,000 km = 156 thousand miles
500,000 km = 311 thousand miles
750,000 km = 467 thousand miles
And there are rumors of special treatment if you get to 1 million miles

I have 3 MBs, my 98 E300 already has a 250k, my 87 300TD should have it but can't prove it due to the odometer failing, and my 08 ML320 is approaching the 250k mark, I am at 136k miles.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech