Gear Guard EP 140 GL-4

It looks like you're mentioning a type of gear oil with specific specifications and a brand name. "GEAR GUARD" is likely the brand, and "EP 140 GL-4" refers to the specifications of the gear oil.

Here's what those specifications typically mean:

EP 140: This refers to the viscosity grade of the gear oil. The "EP" stands for Extreme Pressure, indicating that the oil is designed to handle high-pressure and heavy-duty conditions. The "140" represents the viscosity of the oil, which indicates its resistance to flow at different temperatures. Higher numbers generally indicate thicker oil.
GL-4: This is a gear oil specification established by the American Petroleum Institute (API). GL-4 oils are designed for manual transmissions and transaxles. They provide adequate protection for gear sets, but they are typically used in less severe conditions compared to GL-5 oils.
Gear oils with GL-4 specifications are suitable for applications such as manual transmissions, transaxles, and other gearboxes where the manufacturer specifies a GL-4 oil.

As for the "Gear Guard" brand, I don't have specific information about it in my training data up to September 2021. It's possible that it's a brand of automotive lubricants, and "GEAR GUARD" might offer various types of gear oils designed for different applications and specifications.

When selecting gear oil, it's important to follow the manufacturer's recommendations for the specific application and operating conditions to ensure proper lubrication and protection of the gear components. If you have any specific questions about the "Gear Guard" brand or need more detailed information about gear oils, I recommend contacting the manufacturer or a reputable automotive lubricant supplier.