1999-2009 [Subscribe to Daily Digest] |
There's a red one and a green one and a blue one and a yellow one ...
And orange ...
Your '99 started life with blue (G48). Blue (G48) and Yellow (G05 - aka bottled Benz coolant) are very similar and you can probably switch freely between them, or even mix them. I'd use the blue one myself, but wouldn't argue if someone else recommended yellow.
Orange (Dexcool) and red (ELC) are similar to each other. They function similarly to Blue and Yellow but use a different chemical. (Red is essentially the same as Orange, but with the addition of Nitrite to prevent cavitation on wet cylinder liners, something found only in Heavy Duty Diesels and ancient Renaults, Peugeots, and perhaps Alfas.) You can probably switch betwen blue/yellow and red/orange with a good flush in between if you need to, and red/orange to blue/yellow is probably a better idea than the reverse. Green is the traditional American product, and you should probably avoid it unless that is/was your starting point, in which case you could well stay with it.
FWIW, some of the older design GM truck engines do very poorly with DexCool. Dexcool seems to be very sensitive to high oxygen levels in the coolant, which results in severe corrosion to iron. These older vehicles have their overflow tanks *outside* of the pressurized system and open to the atmosphere. This oxygenates the coolant, a process which gets even more severe if there's some coolant leakage. If the coolant recovery bottle empties, it goes to hell in a hurry, and with their iron blocks (and heads in some cases) the cooling system gets caked solid with brown sludge (rust). Something to consider when choosing between an all-aluminum in-line 6 and an iron block V-8 for your 9-7 (running and ducking)
posted by 24.166.84...
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