Abstract
SINTEF has recently conducted a re-check study of Oseberg A (Strøm, 2013), and an updated weathering study of the oil, including dispersibility testing was recommend. Based on the recommendation, Statoil asked for a weathering study in small-scale at 5 and 13 °C, reflecting summer and winter temeratures in the North Sea. The weathering data was further used as input to the SINTEF Oil Weathering Modell (OWM) to predict the oil properties at the sea surface of Oseberg A. The weathering properties are discussed related to oil spill response.