Technical reference for ISO VG 100 hydraulic oil, covering operating conditions, typical applications, and specification requirements.
Operating context
ISO VG 100 hydraulic oil is a high-viscosity, mineral-base hydraulic fluid used in systems operating under heavy load, elevated operating temperatures, or where internal clearances are larger due to design or service wear. It is typically selected for industrial hydraulic systems and heavy-duty mobile equipment operating under continuous or severe duty conditions.
The viscosity grade is defined by ISO 3448 and corresponds to a nominal kinematic viscosity of 100 mm²/s at 40°C.
Typical equipment use
This viscosity grade is generally specified for hydraulic systems requiring increased oil film thickness to maintain component separation and load-carrying capability.
- Heavy-duty industrial hydraulic power units
- Presses, forging equipment, and forming machinery
- Large injection moulding and production plant
- Mobile and off-highway equipment operating in warm or high-load conditions
- Hydraulic systems within waste, recycling, and bulk-handling facilities
Viscosity behaviour in service
The higher viscosity of ISO VG 100 provides increased film strength and supports stable lubrication under sustained load and elevated operating temperatures. This makes it suitable for systems exposed to continuous operation, high pressures, or severe duty cycles.
At lower ambient temperatures, higher viscosity increases resistance to flow and may affect start-up behaviour. For this reason, ISO VG 100 should only be used where specified or permitted by the equipment manufacturer, particularly where cold-start operation is expected.
Specification requirements
ISO VG 100 hydraulic oils are formulated to meet defined performance standards. The required specification is determined by system design, operating pressure, temperature range, and duty cycle.
- ISO 11158 HM for standard anti-wear hydraulic systems
- DIN 51524 Part 2 HLP for mineral-base anti-wear systems
- ISO 11158 HV where viscosity–temperature stability is required
- DIN 51524 Part 3 HVLP for systems exposed to temperature variation
Operating environment considerations
ISO VG 100 is commonly used in industrial environments where operating temperatures remain moderate to high and equipment operates under sustained load. In demanding applications, such as waste processing and heavy materials handling, contamination control and specification discipline are essential to maintaining hydraulic system reliability.
Where multiple hydraulic oil grades are stored or handled on site, clear identification of ISO VG 100 systems supports correct oil use and reduces the likelihood of misapplication.
Compatibility and grade control
ISO VG 100 should only be replaced with another viscosity grade where substitution is permitted by the equipment manufacturer. Using lower-viscosity oils may reduce load-carrying capability, while higher-viscosity oils may adversely affect system response.
When changing suppliers or specifications, compatibility with seals and residual oil should be confirmed, to avoid unintended system effects.
Product availability
Sinopec Online supplies ISO VG 100 hydraulic oils formulated to recognised international standards for industrial and mobile hydraulic systems.
All Sinopec lubricants supplied by Sinopec Online are genuine, factory-sealed products, backed by technical support.
Technical support
For product selection support, contact Sinopec Online or call +44 020 8068 3444.