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Well if I were a betting man, I'd say the gold coolant was Zerex G-05. Mercedes used that up until a year or two ago when it was updated to a "blue" version.
FWIW I use G-05 in my E320, can source it at NAPA.
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-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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