High Viscosity Index Hydraulic Oil
For machines that start below freezing and run hot the same day, or work across a wide seasonal range on one fill. Holds viscosity across temperature better than a standard grade.
Features
- Keeps viscosity closer to the pump's design window at both ends of the working range, which reduces cold-start cavitation and hot-running wear.
- Allows one fill across a season where a standard oil would need two, which simplifies a depot's holding.
- Shear stability is the property to ask about: a high index achieved with a shear-unstable improver loses viscosity in service.
- Usually worth the cost on machines with variable piston pumps and on anything left outside overnight in winter.
- The fluid's viscosity at the highest measured system temperature is the figure to check, not the grade at 40 degrees C.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Viscosity grade at 40 degrees C | 46 | mm2/s | the nominal grade, comparable to a standard oil |
| Viscosity index | 150 - 200 | the property being bought | |
| Viscosity at 100 degrees C | 8.5 | mm2/s | what the pump actually sees when the machine is hot |
| Shear stability | viscosity retained after shear testing | an unstable oil loses its advantage within weeks | |
| Pour point | -36 | degrees C | the cold-start limit for outdoor plant |