Suginami has a valid point, why risk an expensive car for the sake of a few dollars? I am still at a loss though, as to why my 30 year old SLC has been perfectly happy with coolant other than MB and yet our 300TE with dealer service history had such a badly corroded head gasket. Also, why is your MB coolant yellow and ours blue? It's not like we pee blue here in Oz!

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.