Its very much a USA thing.
MB car clubs over here dont bother with them.
Interesting that you talk in terms of KM & not miles. I thought the USA still used miles.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

Well since Mercedes is German they do it in KM and I don't thinks its different for the US... I think the only one they have for the US is the 1,000,000 mile but it might even have that listed in KM... Here is some info about the marks by which you can get the award: http://daveknowscars.com/2010/02/07/the-mercedes-benz-high-mileage-award-does-your-car-qualify/

We still use miles but the badges only come in kilometers. At 312K miles I sent for the 500K kilometer badge. I have both the 250K and 500K badges on the grill of my '84. I kind of like them. Stirs up conversation and people find out more about the longevity of diesels.

Richard

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85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60