Maintenance An oily water separator is not a main engine, the ships operation is not dependent from it, and the ship owners earn no profit with it. often an oil water separator is still estimated a necessary evil This is a false opinion The use of the oily water separator may protect the ship owner and ship crew getting fined, because of prohibited pollution of the sea from oilMaintenance • An oily water separator is not a main engine, the ships operation is not dependent from it, and the ship owners earn no profit with it. Often an oily water separator is still estimated a necessary evil” This is a false opinion! The use of the oily water separator may protect the ship owner and ship crew getting fined, because of prohibited pollution of the sea from oil