HVI (High Viscosity Index) Hydraulic Oils are designed for hydraulic systems operating across wide or fluctuating temperatures. They are commonly used in construction equipment, machine tools, mobile plant, and hydraulic control systems where consistent performance and precise operation are required.

A high viscosity index helps the oil maintain stable performance in both hot and cold conditions. This improves hydraulic efficiency, reduces wear, supports smoother operation during cold starts, and helps protect sensitive hydraulic components from damage caused by temperature-related viscosity changes.

The Pennine HVI Hydraulic Oils range is available in several ISO viscosity grades including ISO VG 15, 32, 37, 46, 68, and 100, allowing users to select the correct fluid for their specific operating conditions and equipment requirements.