Environmentally acceptable lubricants required in Oil-to-Sea interfaces where technically feasible. With the recent release of the 2013 Vessel General Permit (VGP), vessel owner/operators must review their operational practices for incidental discharge of lubricants to the marine environment. Lubricant discharge limits from oil-to-sea interfaces are just one of 27 specific discharge categories covered by the VGP for vessels to achieve compliance with the US Clean Water Act (CWA).