Joreto,

I second loubapache's recommendation. My Euro 16V developed a whine at normal highway speeds after about 190,000 miles. My son, the current "owner" of the car and I changed the fluid from a standard Redline product to the shockproof version, and the whine went away. The change was done at about 200,000 miles and has stayed away for nearly 6,000 miles. 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)