Applications Applications Applications Applications
Lube Additives for Automotive/Truck Gear Oils
Overview:
Hypoid and heavy-duty gear sets operate with high sliding and Hertzian contact stresses, demanding EP performance and thermal robustness to prevent scuffing, pitting, and micropitting.
Why an additive package is required:
- Provide EP film-forming chemistry to prevent welding/scuffing under shock loads.
- Mitigate micropitting and wear in boundary/mixed regimes.
- Control foaming and air entrainment for reliable sump lubrication and cooling.
- Protect copper alloys (synchronizers, bushings) and resist oxidation.
Typical additive families employed:
Sulfur–phosphorus EP packages, AW agents, friction modifiers (for synchronized transmissions), antioxidants, anti-foam, corrosion inhibitors/metal deactivators, demulsifiers.
Indicative performance tests:
FZG scuffing/micropitting (ISO 14635/ISO 15144), 4-ball EP/wear (ASTM D2783/D4172), copper corrosion (ASTM D130), foam (ASTM D892), demulsibility (ASTM D1401).
Recommended PX Products
|
Product
|
Function
|
Dosage
|
|---|---|---|
|
PX 3823
|
Dispersant/Detergent
|
0.5 – 2.0
|
|
PX 3825
|
Friction Modifier
|
0.1 – 1.5
|
|
PX 3841
|
Anti-foamant
|
0.05 – 0.30
|
|
PX 3849
|
Extreme Pressure/Antiwear
|
0.5 – 1.5
|
|
PX 3846
|
Extreme Pressure/Antiwear
|
0.5 – 1.5
|
|
PX 3862
|
Corrosion Passivator
|
0.1 – 0.5
|
|
PX 3871
|
Friction modifier Grease Thickener
|
0.3 – 1.5
|
|
PX 3872
|
Friction modifier Grease Thickener
|
0.3 – 1.5
|
|
PX 4005
|
Dispersant
|
1.0 – 2.0
|
|
PX 4006
|
Dispersant + Lubricity
|
1.0 – 2.0
|
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