ALl you need to do is call 1.800.FOR.MERC and tell them you want a "high mileage award" form. They will send it to you, you take it to the closest MB dealer for them to sign (they didn't even verify, just signed it) and send it back to Mercedes Benz.
They say that it takes up to 4 weeks to process.
Current: '91 300TE 4MATIC 317k and climbing...
'81 300TD Wagon 168K "Tank"
'83 240D 216K 4spd manual "Da Bear" (aka best car ever)
"Never sweat the petty things...
and never pet the sweaty things."