Correct viscosity selection is critical to industrial gear reliability. Gear Oil 68 is formulated to protect enclosed gear systems operating under moderate loads, where stable oil film strength, controlled wear, and thermal reliability directly influence service life and maintenance cost.
Gear Oil 68 is an industrial gear lubricant formulated for enclosed gear systems that require ISO VG 68 viscosity performance under continuous or semi-continuous operation. It is designed to maintain a stable lubricating film between gear tooth surfaces, reducing friction, wear, and heat generation in mechanically loaded systems.
In industrial gearboxes, incorrect viscosity selection is one of the primary causes of premature wear. Gear Oil 68 provides a balance between sufficient film thickness and controlled fluidity, making it suitable for gear systems where loads are moderate and operating temperatures are stable. This balance helps protect gear surfaces while avoiding excessive internal drag that can increase energy consumption.
Gear Oil 68 is intended for use in enclosed industrial gear systems lubricated by splash or circulation methods, including:
It is commonly applied in manufacturing plants, processing facilities, and general industrial environments where equipment operates continuously under predictable load conditions.
Within lubricant classification, Gear Oil 68 belongs to the Industrial Gear Oils category and is typically selected when gearbox manufacturers specify ISO VG 68 for standard-duty industrial gear operation.
This section defines the fundamental technical parameters that determine whether Gear Oil 68 matches the mechanical design, lubrication method, and viscosity requirements specified by the gearbox manufacturer.
These specifications support reliable lubrication performance in gear systems designed around ISO VG 68 viscosity requirements.
Performance characteristics describe how the lubricant behaves under real operating conditions, translating formulation features into measurable protection, stability, and service-life outcomes.
Gear Oil 68 maintains a consistent lubricating film under moderate mechanical load.
Outcome: Reduced metal-to-metal contact and lower surface fatigue on gear teeth.
Anti-wear additives form a protective boundary layer on contacting surfaces.
Outcome: Slower wear progression during steady-state operation and start-up cycles.
The formulation resists viscosity loss caused by sustained operating temperatures.
Outcome: Predictable lubrication performance over extended operating periods.
Oxidation resistance slows oil degradation in the presence of heat and air.
Outcome: Supports longer oil service life and helps reduce deposit formation under appropriate operating conditions.
Gear Oil 68 is compatible with common steel gear alloys and standard industrial sealing materials used in enclosed gear systems.
Not Recommended When:
For gear systems exposed to shock loading, impact forces, or high contact stress, an EP gear oil with higher load-carrying capability may be required instead of Gear Oil 68.
Practical guidance: If gear operation involves audible knocking, visible scoring, or vibration caused by impact loading, a higher-performance EP gear oil may be more appropriate.
Choose Gear Oil 68 when:
Do not select this grade if your application involves heavy shock loading, severe vibration, or extreme temperature fluctuations. In these cases, selecting a lubricant with enhanced extreme-pressure characteristics or a different viscosity grade will reduce the risk of accelerated wear and unexpected downtime.
Correct viscosity selection directly affects energy efficiency, component life, and maintenance planning.
Gear Oil 68 is formulated to align with common industrial gear oil requirements, including:
Always verify lubricant selection against OEM gearbox specifications.
Is Gear Oil 68 suitable for worm gears?
It may be suitable for lightly to moderately loaded worm gears if approved by the equipment manufacturer. Heavily loaded worm gears often require specialized formulations.
Can it be used in circulating lubrication systems?
Yes. Gear Oil 68 is suitable for both splash and circulating systems designed for ISO VG 68 oils.
How does viscosity 68 affect efficiency?
ISO VG 68 provides sufficient film thickness for protection while minimizing excess drag that can increase power consumption.
| Property | Standard | Value |
| Viscosity Grade | ISO 3448 | ISO VG 68 |
| Density at 20 °C (68 °F) | ASTM D1298 | ~0.87–0.89 g/cm³ |
| Kinematic Viscosity at 40 °C (104 °F) | ASTM D445 | 68 mm²/s |
| Kinematic Viscosity at 100 °C (212 °F) | ASTM D445 | ~8.6 mm²/s |
| Viscosity Index | ASTM D2270 | ~95–105 |
| Pour Point | ASTM D97 | −30 °C |
| Flash Point (COC) | ASTM D92 | ~220–230 °C |
| Oxidation Stability | ASTM D943 | Good |
| Anti-Wear Performance | ASTM D4172 | Excellent |
| Rust Protection | ASTM D665 | Pass |
| Foam Characteristics | ASTM D892 | Pass |
| Demulsibility | ASTM D1401 | Excellent |
| Air Release | ASTM D3427 | Good |
| Operating Temperature Range | — | Suitable for typical industrial operating temperatures under moderate load conditions |
Gear Oil 68 is a balanced industrial lubricant designed for enclosed gear systems operating under moderate loads. By maintaining stable viscosity, reliable wear protection, and controlled oxidation behavior, it supports predictable gearbox performance and reduced maintenance risk.
For application verification, viscosity comparison, or system-specific recommendations, consult SiNDA technical support or request expert guidance.
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