erubin,

My Father-in-law did this a little while back and the consensus here and by the mechanic he took the car to was it did no damage. In fact, it may have cleaned things out a little. He drove about 50 miles or more, then drove to the shop he uses and had them drain the system, change the filters and refill with Diesel. He is in his mid 80's now and so he rarely does much on the car himself. Overall I think his ego was damaged more than anything in the car. These machines are pretty stout. Good luck, Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)