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According to Valvoline tech support:
1. Color is meaningless...it's simply a dye that is not a reliable guide as to the composition of the coolant.
2. MB used G-05 through 2012; in 2013 and 2014 it was G-48; from 2015 onward it's G-40.
3. If I don't know what's in there (though I'm pretty sure it's G-48), it's best to use G-05 to top off as it has the broadest range of compatibility.
4. The only difference between G-48 and G-05 is that G-48 is phosphate free.
5. The proper coolant for my car (that which I should use when I change the coolant) is G-05.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 161k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, wastegate conversion, ALDA delete
19 Honda CR-V EX 81k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife
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