Selection Guide to choose SAE Synthetic Gear Oil

How can you tell which SAE gear oils suitable for a certain application? It's usually as easy as looking through a maintenance handbook and picking a product from the QPL (qualified product list). Sadly, this method may not always provide the best lubrication for the most efficient lubricant inventory management or a particular gear set.

Some original equipment manufacturers (OEMs) provide generic specs that include important details. Others, on the other hand, simply offer a general description that may or may not mention operating temperatures. It is consequently critical for those in charge of lubricant selection to have a basic grasp of how to specify lubricants for gears.

It is critical to comprehend and be able to read the specifications provided by equipment makers, as well as to understand why they are provided and to be able to make modifications as needed.

Many considerations must be taken into account when selecting SAE gear oil for industrial gears, including product availability, operating circumstances, desired lubricant brand, and product consolidation attempts, in addition to just picking a product from the maintenance manual's QPL.

With a strong grasp of this, the lubrication engineer may enhance machinery dependability in typical settings while also using lubricant specification as a problem solution in unusual situations.

Gear Oil Selection Criteria

The following parameters must be considered while selecting the optimal lubricant for a gear set:

  • Viscosity: The most significant quality of a lubricating oil is its viscosity, which is often referred to as the most important attribute of a lubricating oil. 75W-85 gear oil can be the best pick in this aspect.
  • Additives: The lubricant's additive package determines the lubricant's overall category and influences a variety of essential performance parameters under operating situations.
  • Base Oil Type: The operating circumstances, gear type, and other aspects should all be considered when choosing a base oil.


Finding the recommended viscosity grade in a component's maintenance manual is generally all that is required. Unfortunately, the manual is not always available, or the equipment is used in situations that are not consistent with the OEM's guidelines. As a result, it's critical to comprehend the approaches for viscosity selection as well as the components that influence the requirement. Considering SAE gear oil could be a smart step to choosing the right gear oil.

A gear oil’s viscosity is largely chosen to provide a certain film thickness between interacting surfaces at a given load and speed. Because most viscosity selection methods make it impossible to estimate the load, the load is assumed and speed becomes the determining factor.

Gear Lubricant Type and Additive Selection

The fundamental type of lubricant must be chosen once the viscosity grade has been determined. While there are numerous variants, gear lubricants may be divided into three groups: R&O, anti scuff, and compounded. The operating circumstances will decide which gear lubricant type is suitable for a certain application.

Because there are no established rules to guide this decision, it's a bit of a guessing game. Many manufacturers will provide a viscosity requirement and leave it up to the user to determine. Others will choose for EP lubricants in their applications to be safe. As a result, it's critical to comprehend the broader factors that influence this demand.

Base Oil Selection

Mineral base oils of good grade work well in most applications. Mineral base oils, on the other hand, have higher pressure-viscosity coefficients than synthetics, allowing for thicker films at lower operating viscosities. Synthetic base oils, on the other hand, are preferred in some cases.

Many synthetic base stocks have a higher intrinsic resistance to oxidation and heat degradation, making them ideal for high-temperature applications and, in certain circumstances, allowing for longer service intervals. Due to their high viscosity index and low pour points, synthetics also function better in machines that are subjected to low ambient temperatures.

Choose 75W-85 Gear Oil

SAE synthetic gear oil from DOXA is a premium gear lubricant. It is made from carefully chosen chemical additives and solvent-refined mineral base oils. These oils provide good gear protection and may be utilized in a broad variety of temperatures due to their strong shear stability. It also protects against oil foaming, as well as gear wear and corrosion.

The oil is designed for high-speed gears in automobiles. At low temperatures, it offers excellent lubrication without channeling. It also provides superior resistance to rust, pitting, and corrosion.75W-85 Gear Oil is the most suitable for use in heavy-duty trucks and bus gears that operate at high temperatures. It also offers excellent corrosion resistance.

Doxa75W-85 gear oil is indicated for gears with hypoid service characteristics in passenger automobiles and other automotive-type equipment that run at fast speeds with low torque and low temperatures. It is compatible with 2017 and newer DT12 engines.

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