Final answer:
Loss of oil pressure in a multi-engine aircraft with a constant speed prop will typically move the propeller toward the feathered position, which creates high drag and minimizes the potential for the non-functioning propeller to negatively affect the aircraft's performance.
Step-by-step explanation:
On a multi-engine aircraft with a constant speed propeller, the loss of oil pressure will typically cause the prop to move toward feathered position, which is a high-drag and low RPM condition designed to minimize the drag produced by the non-functioning propeller. In constant speed prop systems, oil pressure is used to adjust the pitch of the blades, and if pressure is lost, the propeller will typically default to the feathered position due to a spring or counterweights designed into the system. However, the exact behavior can depend on the specific design of the propeller system.