What type of oil typically contains an EP additive?

Gear oil typically contains Extreme Pressure (EP) additives, which are specially formulated to protect gears under high load and shear conditions. This type of oil is essential in applications involving gear systems that operate under significant pressure, helping to reduce friction and wear on gear surfaces. EP additives are designed to form a protective film on the surface of the gears, which prevents metal-to-metal contact and reduces the risk of scoring and pitting.

In contrast, hydraulic oils are primarily designed to transmit power and often contain additives for anti-wear and anti-foaming, but not necessarily EP additives. Engine oils are formulated to provide lubrication, cooling, and cleaning in an engine but focus more on preventing deposits and wear rather than extreme pressure conditions. Compressor oils support the functioning of air compressors and may contain various additives to improve performance, yet they do not typically require EP additives to the same extent as gear oils.