The message is REDUCE engine oil, as in your level is too high.

Do you know how to measure the oil level (i.e. the actual numerical value) via instrument cluster? If so, let us know what the value is. If not, I can tell you how to do so.

FYI on my CDI my reading is 7.5 quarts after having been brought to operating temp and then sitting for three hours.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k 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