Capt Kirk,

When I got my citric acid it was a largish jar of powder with no instructions. I asked the parts guy at the dealer how you use it, and he did not know but asked one of the guys in the shop. He said to just dump it in the radiator/coolant fill opening, and fill the system with water, then let it run at temp for about half an hour. That is what I did and it seemed to work. 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)