The additive package is where the magic happens for GL-5; it includes sulfur-phosphorus compounds that create a reactive layer on gear surfaces, ZDDP (zinc dialkyldithiophosphate) for anti-wear protection, and rust inhibitors that keep moisture at bay. This specification is reserved for gears operating under the most demanding conditions, typically involving sliding motion such as those found in hypoid gears common in rear differentials.
Understanding ZDDP Performance Benefits in GL-5 Gear Oil
It is distinct from lower grades like GL-4, as it contains higher levels of extreme pressure (EP) additives that prevent metal-to-metal contact during the high-stress engagement cycles of hypoid gears. This ensures optimal shifting feel in manual transmissions and prevents potential damage to synchronizers and bearings that are engineered for lower friction coefficients.
Excellent thermal stability to prevent breakdown at high operating temperatures. To achieve this rating, a lubricant must demonstrate exceptional thermal stability, resistance to oxidation, and the ability to maintain a protective film between metal surfaces even when subjected to shock loads and varying temperatures.
Understanding ZDDP Benefits in GL-5 Gear Oil
The base oil, whether mineral, synthetic, or a blend, provides the fundamental lubricating film. Key Performance Characteristics High resistance to wear and scuffing under extreme pressure.
More About Gl5 gear oil
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