Date registered: May 2016
Vehicle: 2000 S430, 2003 S430, 2003 S600 TT, and 2005 E320 CDI
Mentioned: 188 Post(s)
Quoted: 995 Post(s)
Yes, Noodles is correct. I use Xerex G-05 in the '03 S430, and it's actually bright yellow. You can mix G-05 and G-48 and it does turn green (Kajtek is correct). However, if I see green in there, I don't know what it is, so I flush with distilled water and then refill with a 50/50 mix of either G-05 or G-48, whichever one's on sale. Both are correct for our cars, including the CDI's.
The Prestone-style bright green coolant that you get at the local auto parts store, for cars such as 1990's-era Honda Civics, Toyotas, and so on, is definitely *not* correct for our cars. Same goes for the Walmart brand of "generic for most cars" coolant; it's great in my Civics, but not for this era of Mercedes-Benz.