What statement is true concerning oil-lubricated stern tube bearings?

Correct Answer: Option D — The forward and after seals are both designed to retain the lubricating oil within the bearings and the after seal is designed to prevent the ingress of sea water.

Under USCG National Maritime Center examination standards, the accepted correct answer is: The forward and after seals are both designed to retain the lubricating oil within the bearings and the after seal is designed to prevent the ingress of sea water..