Quote:
Originally Posted by oldnavy
When green antifreeze used in old 91 300D IDI it had the caveatting problems and foamed the antifreeze, with the GO5 no problem. I suspect the MB's are not suffering the problem like the Ford or Dodge large diesels with twice the displacement and higher compression ratio's.
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Aluminum heads brought about the concern for MB as well. Cavitation is an extreme mechanical case of removing the oxide layer that seals and protects any corrosion resistant metal. Once the oxide layer is gone, it forms again, and if the removal and replacement process continues unabated, it leads to "electrolysis driven" galvanic corrosion of dissimilar metals. Thus the special aluminum friendly ratings for coolants. They carry "stuff" to chemically try to minimize this sequence. Once they are used up, the process will continue. Thus the need to change the coolant.
RedLine makes an additive I have used in all aluminum, and then later, all my car's coolant systems called Water Wetter. It is intended to reduce the surface tension between the metals and the coolant, improve heat transfer and limit cavitation type damage. In my experience with the 2.3-16 engines, it does a nice job. No signs of any kind of cavitation damage after >200k miles when we had to take the head off.
You can add more Water Wetter after its projected life on the bottle, two years or so, expires. Or you can change the coolant and the Water Wetter every two years.
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)
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