Full Synthetic SAE 85W-140 Heavy Duty Gear Lubricant

Product Overview

Full Synthetic SAE 85W-140 Heavy Duty Gear Lubricant is a high-performance lubricant engineered for extreme-duty conditions in automotive, industrial, marine, construction, and agricultural gear systems. formulated with advanced synthetic basestock, it delivers outstanding wear protection, oxidation stability, and thermal robustness to extend gear life under high load, high temperature, and shock-loading scenarios. The product exhibits a clear to amber appearance with a mild petroleum odor and a recommended viscosity of 15 cP at 25°C, ensuring reliable film formation and shear stability across a broad operating envelope. Its density at 25°C is 0.885 g/mL, aligning with industry expectations for high-performance gear oils and enabling compatibility with common gear housing materials and seals.

This lubricant meets or exceeds API GL-5 performance requirements and MIL-PRF-2105E military specifications, providing robust protection against wear, pitting, and thermal degradation while maintaining excellent fluidity at lower temperatures. With a high flash point (~200°C) and low vapor pressure, the formulation offers enhanced safety in enclosed systems and reduced vapor generation under typical operating conditions. The product is designed for heavy-duty differential and manual transmission applications, as well as industrial gear trains, marine gearboxes, and equipment exposed to demanding operating environments.

Key Properties

• Appearance: Clear to amber liquid
• Odor: Mild petroleum odor
• CAS: 123456-78-9
• Solubility: Insoluble in water, soluble in organic solvents
• Density (25°C): 0.885 g/mL
• Viscosity (25°C): 15 cP
• Refractive Index (20°C): 1.460
• Boiling Range: N/A
• Pour Point: Not specified in data
• Flash Point: 200°C (392°F)
• Molecular Weight: 870.50 g/mol
• Specific Gravity (20°C): 0.885–0.89 (typical 0.885)
• Water Content: Karl Fischer titted, typical 0.1 wt% (max 0.5 wt%)

Common Applications

• Heavy-Duty Gear Lubrication: automotive differentials and manual transmissions requiring superior wear protection and thermal stability
• Industrial Gear Systems: high-load gearboxes and gear trains in manufacturing environments demanding reliability under elevated temperatures
• Marine Gear Applications: gearboxes and stern drives with strong water resistance requirements
• Construction Equipment Lubrication: hydraulic and gear systems in harsh, dusty environments with high stress
• Agricultural Equipment: machinery subject to varying temperatures and heavy loading for extended service intervals

Safety Precautions

The product is classified as a combustible liquid with hazard statement H227 and may be harmful if swallowed and enters airways (H304). Handle with appropriate PPE, including chemical-resistant gloves, safety glasses, and protective clothing. Store in a cool, dry place away from direct sunlight and incompatible oxidizers; keep containers tightly closed when not in use and ensure adequate ventilation in work areas.

In case of exposure, follow standard first aid measures: eyes—rinse cautiously with water for several minutes; skin—wash with soap and water; inhalation—move to fresh air; ingestion—do not induce vomiting, seek medical attention. Transportable as UN 1993, Flammable liquids, n.o.s., Class 3, Packing Group III. Refer to SDS for complete emergency procedures, spill response, and disposal guidance.

Benefits

✔ Exceptional wear protection – forms a durable lubricating film under high load to minimize gear wear and extend component life.
✔ Superior thermal stability – high flash point and oxidation resistance reduce varnish formation and thermal degradation in demanding service.