When should the oil in a vacuum pump be replaced?

The oil in a vacuum pump should be replaced after every evacuation to ensure the pump operates efficiently and effectively. During the evacuation process, moisture, contaminants, and other debris can be introduced into the pump’s oil. This can degrade the quality of the oil, leading to reduced lubrication and increased wear on the pump components. By replacing the oil after each use, the likelihood of these contaminants affecting the pump's performance is minimized, ensuring optimal reliability and longevity of the equipment. Regular maintenance, including oil changes, is crucial for maintaining the vacuum pump's capacity to create and maintain the desired vacuum levels in refrigeration and HVAC systems.