Remember, if you push the car in a gear, like third, and get the engine to roll over a few "teeth" on the flywheel, the starter will work fine. My wife thought that was a bit much. I used to just park on a hill, let the car roll forward a bit once the glow plugs had cycled, and then let out the clutch and turn the key, then put the clutch in and bingo! it worked every time. She drove the car half the time and thought that was unacceptable. You may find it works just fine while you are waiting. 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)