Which of the following lube oil filters would be considered acceptable for use with today's high detergent additive type oils?
Official USCG Answer & Rule Citation
Correct Answer: Option D — 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, degrading oil quality. Cotton waste or cellulose-based cartridges are preferred as they effectively trap particulates without removing essential chemical additives, maintaining the oil's performance characteristics per marine lubrication standards.
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