In which lubrication application is a detergent type oil most likely to be used?

Correct Answer: Option B — Trunk type diesel engine lubricating oil.

Trunk-type diesel engines require detergent-dispersant oils to manage combustion byproducts, such as soot and sludge, which accumulate in the crankcase. Unlike turbine oils, which prioritize water separation and oxidation stability, trunk engine oils must keep contaminants in suspension to prevent deposits on pistons and rings.