At what oil temperature range is normal oil pressure achieved at altitudes below 21,000 feet?

The correct range for achieving normal oil pressure at altitudes below 21,000 feet is between +60 °C to +71 °C. Maintaining oil within this temperature range is crucial for optimal engine performance and lubrication. At temperatures below +60 °C, the oil may not flow efficiently, leading to potential lubrication issues and inadequate pressure readings. Conversely, temperatures exceeding +71 °C can lead to reduced viscosity, increasing the risk of oil breakdown and inadequate lubrication. This range ensures consistent pressure readings that are vital for reliable engine operation, particularly in maintaining the T-54A's performance during various operational conditions. Understanding these parameters helps operators in assessing engine health and ensuring efficient and safe operation of the vehicle in varying altitudinal environments.