http://www.mercedestechstore.com/pdfs/416_Telematics/416%20HO%20D2B%20(CooksonI)%2003-09-04.pdf

PDF file with an overview of the way D2B works for anyone interested

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E