Learn how GL-5, GL-4, FD1, and TO-4 gear oils differ and why choosing the correct spec is essential for maximizing vehicle performance and protection.

The designation API GL-5 denotes lubricants intended for gears, particularly hypoid (see note) gears, in axles operating under various combinations of high-speed/shock load and low-speed/high-torque conditions.

2022年7月5日 · GL-4 gear oils are typically recommended for spur and helical gears found in manual transmissions and transaxles operating under moderate speeds and loads. GL-5 gear oils are typically recommended for hypoid gears in automotive axles operating under high-speed, high-load conditions.

2022年11月3日 · GL-4 and GL-5 gear oils are two distinct lubricants designed for various applications in the automotive world. Here are six key differences that set them apart. 1. Extreme Pressure (EP) Additives. The role of extreme pressure additives (EPs) in GL4 and GL5 gear oils can help clarify the differences between these oils.

What Does GL Stand For In Oil? The starting point in the GL4 vs. GL5 discussion is deciphering the meaning of GL. It means gear lubricant showing you the designation of the product, which is for the vehicle’s gear unit.

2025年1月3日 · GL-5 is suitable for hypoid gear service under severe service and shock loads and not for use in a gearbox. When you are choosing a transmission or gear oil you might be wondering what GL-4 and GL-5 mean and what the differences are between these two…

The API classifies gear oils using a system of GL ratings, ranging from GL1 to GL5. These ratings provide information on the performance level of gear oils and help you select the right product for your specific needs.