Strange question, I know....just looking for a little hand holding while I wait to do an oil analysis. I'd say I've lost a solid inch, perhaps more, of coolant (measuring expansion tank level)....but have not observed any leaks. Oil in the dipstick is jet black...I may extract a quart or so this afternoon to see what I see.

Oil's been in there 7500 miles. If I pull some out, and see no milkiness whatsoever, can I safely assume that that coolant has not gone into the engine?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife