differential oil additive is a special friction modifier that helps to eliminate chatter in limited-slip differentials. It also reduces banging and clunking associated with automatic locking differentials in vehicles.

The gear oil keeps ring and pinion gears, spider and side gears, limited slip differentials, axles, bearings, and other driveline components lubricated and running smoothly. However, if these vital parts are not properly cared for, it can lead to a multitude of problems.

Using low quality oils that don't meet the required industry specifications will quickly degrade the additive package in the oil, which in turn leads to increased viscosity, sludge, varnish, oxidation and wear. These deteriorating conditions will eventually require the replacement of the oil.

In contrast, top-quality lubricants meeting the correct industry specifications will continue to protect these critical parts for years to come. And as a result, they will provide greater fuel economy and a longer service life for your car, truck or SUV.

There are several different types of additives in a typical gear oil. The most common are anti-wear (AW) and corrosion inhibitors. These chemical compounds are activated by contact between metal surfaces to form a ductile, ash-like film that minimizes adhesive wear. They also help protect the base oil from oxidation and metal damage by corrosive acids.

The concentrations of these chemical compounds in a gear oil may vary from one formulation to another. This can cause a reduction in effectiveness of some AW and corrosion inhibitors, as well as an increase in the risk of engine icing or reduced catalytic converter life.