Presuming it is engine oil and nobody has put any oil in the rad system by mistake, the most common reason for this is failure of the head gasket in the area of the oil passage through to the overhead gear. Is there any sign of water in the sump? It is usually a one way affair as oil pressure is higher than water pressure.
Mercedes-Benz Servicing, repairs, engine and diagnostics Wayne Gates - Mercedes-Benz, Unit F3, Phoenix Industrial Estate, Rosslyn Crescent, Harrow, Middlesex, HA1 2SP Tel: 020 8863 9233 Established for 20 years all vehicles washed and vacuumed.
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