What type of oil is labeled as "brownish" and used for hubs?

The type of oil commonly labeled as "brownish" and used for hubs is the 85-140 Gear Oil. This oil is specifically designed for use in differentials and other gear applications. Its formulation includes additives that provide the necessary viscosity and lubrication properties, allowing it to perform effectively under high pressure and temperature conditions.

In particular, the designation of 85-140 indicates the oil's viscosity at different temperatures, with the first number representing its flow at low temperatures (85) and the second number indicating its flow characteristics at high temperatures (140). The "brownish" color can arise from the specific blend of base oils and additives used in the formulation, which may include certain detergents and anti-wear additives that enhance performance and prolong the life of gears and bearings.

This product is favored in applications requiring a heavy-duty lubricant that can handle the stress and heat generated in hub assemblies, making it suitable for automotive and heavy machinery environments.