In this work, we are reporting on the oil pollution in sea water and sediments of the Turkish coast, as well as the oil input calculated from Bosphorus undercurrent water into the Black Sea, between 2004-2007. The highest oil levels were found at the western part stations in the surface water at Terkos station (4), and in the sediments at Zonguldak station (13, 14). We suggest that the high pollution level is probably due to the pollution from Danube River, intensive ship traffic for the stations 1-6, the illegal discharge of ballast water from returning tankers, and also high tanker traffic for the stations 10-20 at the western part of the Turkish Black Sea. On the other hand, high pollution at the eastern coast is correlated with inputs from the neighboring petroleum loading stations. The calculated input of oil from undercurrent of Bosphorus was (in tons): 10422.0 (2004), 5153.10 (2005), 9385.10 (2006), and 6162.50 (2007), respectively.,The oil input from the undercurrent of the Bosphorus to the Black Sea includes sewage of Istanbul and cities of the Sea of Marmara but also the pollution from Mediterranean/Aegean Sea.