In order to maintain the required lube oil temperature leaving a lube oil cooler, where an automatic bypass valve is not provided, which of the following operations is correct?

Correct Answer: Option A — The cooling water discharge leaving the cooler is directly regulated.

When automatic bypass valves are absent, technicians control lubricating oil temperatures by directly regulating the discharge cooling water rate from the cooler, ensuring optimal viscosity is maintained across the bearings and gear train.