Hydraulic
Hydraulic oils transfer power in hydraulic systems used across construction, mining, manufacturing, and mobile equipment. They are classified by ISO viscosity grades (VG 32, 46, 68) and performance types including HM (anti-wear), HV (high viscosity index), and ashless (zinc-free) formulations. The right hydraulic oil depends on system pressure, operating temperature range, pump type, and component metallurgy. HV oils are preferred for mobile equipment operating outdoors in varying temperatures, while HM oils are common in factory hydraulic systems.
Key Specifications
Brands Offering Hydraulic Products
Frequently Asked Questions
What is the difference between HM and HV hydraulic oil?
HM (anti-wear) hydraulic oils provide good wear protection at stable operating temperatures. HV (high viscosity index) hydraulic oils maintain more consistent viscosity across a wider temperature range, making them ideal for mobile equipment that operates outdoors in varying weather conditions. HV oils flow better at low temperatures and resist thinning at high temperatures.
When should I use ashless (zinc-free) hydraulic oil?
Ashless hydraulic oils are required when the system contains silver-plated components, as zinc-based anti-wear additives can cause silver corrosion. They are also preferred in environmentally sensitive applications and systems with specific OEM requirements for zinc-free formulations. Some newer pump designs also specify ashless fluids.
How do I choose the right ISO viscosity grade for my hydraulic system?
The correct ISO grade depends on the pump type, operating temperature, and system pressure. ISO VG 46 is the most common grade for general-purpose hydraulic systems. Use VG 32 for colder environments or systems requiring faster response, and VG 68 for higher temperatures or heavily loaded systems. Always refer to the pump manufacturer’s specifications.
Find Your Hydraulic Equivalent
Use the Universal Oil Matcher to instantly cross-reference hydraulic products across Shell, Mobil, Castrol, Sinopec, Valvoline, Caltex, Fuchs, Penrite, and Gulf Western.
Open Oil Matcher Tool →