When gear equipment is in operation, air is often drawn into the gear oil, leading to foaming within the oil reservoir. Foaming can significantly negatively impact the performance of lubricants, such as their oxidative stability and heat dissipation capabilities. Excessive foaming might result in foam being forced out through the vent holes. In cases of pressure-fed lubrication, there's a risk that foam could enter the oil pump, potentially causing noise or equipment damage. Given this scenario,