Yes, I know....green coolant bad/evil. Only use proper stuff. I do now. BUT, for a long time my 92 300D had the green stuff in there. Now, with 244k miles, it's getting the head gasket replaced.

I know the reason to use MB coolant or G-05 is for the longevity of the plastic parts. But could the green stuff accelerate a head gasket failure? If so, how/why?


To the best of my knowledge, the engine has never overheated (at least not since I took ownership at 137k miles).

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife