If used oil disposed into the oily bilge system it will be fed through the Oil Water Separators (OWS) which is not designed and approved for this purpose. Also in this case oil specified in MARPOL Annex I is being mixed with Annex V. It means the vessel is running the risk of a port state control detention. Since 1 January 2013 cooking oil recommended to be kept separate and returned to the shore. All the records in the MARPOL Annex I Oil Record Book will need to correspond with MARPOL Annex V Garbage Record book for discharge to the shore.
