When selecting a gear oil additive package, it is important to consider the specific requirements and specifications of GL3 gear oil. GL3 gear oils are typically used in manual transmissions and axles with moderate to low sliding friction and do not contain extreme pressure (EP) additives.
Here are some key factors to consider when selecting a GL3 gear oil additive package:
- Anti-wear protection: Look for an additive package that provides good anti-wear protection to minimize gear wear and extend component life.
- Oxidation and thermal stability: The additive package should provide excellent oxidation and thermal stability to resist oil degradation and maintain performance over time.
- Corrosion Protection: Ensure the additive package provides effective corrosion protection to prevent damage to metal surfaces.
- Foam Control: The additive package should contain foam inhibitors to minimize foam formation during gear operation.
- Compatibility: It is important to select an additive package that is compatible with the base oil used in the GL3 gear oil formulation.
When selecting a specific brand or product, it is recommended to consult with a lubricant engineer, manufacturer, or refer to industry standards and specifications for gear oils. They can provide tailored advice and ensure the additive package meets the requirements of GL3 gear oil.

Here are top-rated API GL‑3 / GL‑4 / GL‑5 gear oil additive packages sourced from reliable Chinese manufacturer—ideal for blending GL‑3 gear oils or offering GL‑3/GL‑4 cross-compatibility:
Shanghai Minglan Chemical Co.,Ltd.–T4201C Gear Oil Additive Package
💡 Choosing the Right GL‑3 Additive Package
API GL‑3 is an older specification for manual transmissions and spiral‐bevel axles with moderate load—not severe enough for GL‑4/GL‑5. Choose packages with:
- Recommended 1–2 wt% dosage for GL‑3 application
- Proven bench testing or copper corrosion ≤1b
- Compatibility with your base oil (mineral or synthetic)
📦 Next Steps:
- Request sample TDS/MSDS to verify EP behavior, phosphorus percentage, corrosion resistance, and viscosity influence.
- Trial blend in your base oil—typically 1 wt% for GL‑3.
- Run bench tests: EP, oxidation, rust, foam, and compatibility.
- Confirm terms: MOQ, pricing, lead time, and shipping logistics.


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