It's for the CDI. I know that both G05 and G48 meet the 325.0 spec. Still, I'm giving some reason to pause that G05 lasts 5 years but the CDI change interval is every 143k miles or 13 years (although I do noticed that the manual says that any 325.0 coolant will permit that change interval). For now I simply want to have some lying around in case I were to lose some coolant...and, even though both meet spec, I hesitate to mix the two.

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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