Which of the following lube oil filters would be considered acceptable for use with today's high detergent additive type oils?

Correct Answer: Option A — Cotton waste packed in perforated metal containers or cylindrical cartridges.

High detergent oils contain additives that keep contaminants in suspension. Filters using Fuller's earth or chemically treated materials can strip these additives from the oil, rendering them ineffective. Cotton waste or cellulose-based media are chemically inert and do not react with detergent additives, making them suitable for modern marine lubricants.