In a forced-feed lubrication system, what statement is true concerning lube oil reservoir/sump residence time?

Correct Answer: Option C — The higher the oil level, the longer the residence time, and the cooler the oil will be as delivered by the pump.

Increased oil volume in a sump provides greater residence time, allowing more opportunity for heat dissipation through the reservoir walls and settling of contaminants. Consequently, the oil delivered by the pump is cooler, which improves the lubrication film strength and extends the service life of the lubricated components.