Which description best matches a dry sump lubrication system?

• A. No fixed oil level; uses oil mist
• B. Oil level is maintained at a fixed height
• C. Oil is circulated by a pump only during startup
• D. Oil is replaced hourly regardless of use

Answer: (A)

In a dry sump lubrication system, oil isn’t stored in the engine’s sump; it sits in an external reservoir. Because the oil is kept in a separate tank, the crankcase doesn’t have a fixed oil level. Pumps move oil from the tank to the engine, and scavenger pumps return it to the reservoir, so lubrication is maintained independently of a single bottom-of-pan level. The oil is delivered to the bearing surfaces as a spray or mist through the lubrication paths, which helps ensure reliable lubrication under various operating conditions.

That’s why the description “no fixed oil level; uses oil mist” fits best: there isn’t a set oil level in the crankcase, and lubrication is provided via a sprayed/misted flow from the external system. The other ideas don’t capture this arrangement—having a fixed oil level describes a wet sump, pumping only at startup isn’t how the system operates during run, and hourly replacement is a maintenance routine rather than a defining feature of dry sump lubrication.