It seems like you're referring to "Wet Brake Oil" with the specification "PREMIUM PI-GL-4." Wet brake oil is a type of lubricant specifically designed for use in wet brakes, which are commonly found in agricultural and construction equipment, as well as some off-road vehicles.
The "PI-GL-4" specification refers to the performance level and compatibility of the oil. It's likely that "PI" stands for Performance Index, "GL" stands for Gear Lubricant, and "4" indicates the level of performance. This specification helps ensure that the oil provides the necessary protection and performance characteristics for the wet brake system.
When using wet brake oil, it's important to follow the manufacturer's recommendations and specifications for the specific equipment you're using. Using the correct type of oil is crucial for maintaining the performance and longevity of your machinery.
If you have a specific question about wet brake oil or its application, feel free to provide more details, and I'll be happy to assist you further.