AMSOIL ISO 46 100% Synthetic Multi-Viscosity Hydraulic Oil
Formulated with varnish-control technology to keep hydraulic systems clean for long life and reliable operation. Resists breakdown in the presence of heat while remaining fluid when cold to keep valves, pumps, servos and other components clean, protected and long-lasting. Perfect solution to the common problems that plague hydraulic applications, helping save money.
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Product data sheets
View, download, or save a copy of the Product Data Sheet or Safety Data Sheet for AMSOIL ISO 46 100% Synthetic Multi-Viscosity Hydraulic Oil.
AMSOIL ISO 46 100% Synthetic Multi-Viscosity Hydraulic Oil
AMSOIL ISO 46 100% Synthetic Multi-Viscosity Hydraulic Oil (product code HVI) is an all-season anti-wear hydraulic fluid built for high- and low-pressure gear, vane, and piston pumps in stationary and mobile hydraulic systems, including those with bronze metallurgy. The high-viscosity-index formulation centers on ISO VG 46 at operating temperature and stays fluid in cold starts, making it the right choice for outdoor mobile equipment, large skid-steers, articulated loaders, mobile cranes, and industrial power units that see wide ambient swings.
Varnish-control technology for clean systems
Anti-varnish additives chemically react with the building blocks of varnish and inhibit its formation on valves, servos, and pump internals. Severe oxidation testing showed the oil resisted elevated heat and oxidation more effectively than the conventional reference fluid in the Aluminum Beaker Oxidation Test conducted April 2012, supporting immediate response, fewer breakdowns, and longer service life between fluid changes.
Wear protection for pumps, motors, and valves
The shear-stable formulation is fortified with the latest zinc-type anti-wear additives and posts a Four-Ball Wear scar of 0.41 mm under ASTM D4172 (40 kg, 1,200 rpm, 75 degrees C, 60 minutes). After 608 hours in a Parker Hannifin (Denison) T6H20C Hybrid pump, piston shoes showed only moderate polishing and trace random scratches and the vane pump cam ring exhibited only light polishing and trace scratching. The HVI grade also passes the KRL Shear Test with stay-in-grade performance at the 15 percent maximum KV-loss threshold, so the operating viscosity does not collapse under sustained pump shear.
Wide-temperature fluidity for year-round use
A viscosity index of 161 under ASTM D2270 flattens the viscosity curve, keeping the oil thin enough for cold startup and thick enough at operating temperature. Pour point reaches minus 44 degrees C (minus 47 degrees F) under ASTM D97, and the flash point of 246 degrees C (475 degrees F) under ASTM D92 supports use in heat-soaked outdoor equipment without thinning out.
Yellow-metal compatibility, seals, and rust protection
Compatibility with yellow metals is confirmed by a 1A rating in the Copper Strip Corrosion Test (ASTM D130, 100 degrees C, 3 hours), making the formulation safe for bronze bushings and brass valve components. Elastomer seal compatibility passes SRE-NBR1 nitrile under ASTM D471 (100 degrees C, 168 hours), and rust protection passes both distilled water and salt water legs of ASTM D665.
Foam control, water release, and dielectric strength
Foam tendency under ASTM D892 measures 0/0, 10/0, 0/0 across Sequences I, II, and III, controlling air entrainment that causes spongy response and pump cavitation. Demulsibility under ASTM D1401 reaches 40-40-0 in 20 minutes so condensate can be drained from reservoir low points, and dielectric strength of 44 kV AC under ASTM D877 supports mobile equipment that sees occasional electrical exposure.
Industry and OEM specifications
The HVI grade meets Parker Hannifin (Denison) HF-0, HF-1, and HF-2; Vickers I-286-S and M-2950-S; DIN 51524 Parts 2 and 3; and Cincinnati Milacron P-70. The cross-spec coverage simplifies fluid consolidation across mixed fleets running ISO VG 46 anti-wear hydraulic equipment.
Recommended applications and service intervals
Use AMSOIL ISO 46 Multi-Viscosity Hydraulic Oil in any high- or low-pressure gear, vane, or piston hydraulic system that calls for an ISO VG 46 anti-wear fluid, including stationary industrial power units and outdoor mobile equipment that sees wide ambient temperature swings. Drain intervals depend on system load, contamination, water ingress, and reservoir hygiene, so follow oil-analysis trending and the equipment builder's service manual rather than a fixed mileage or hours figure.
Mobile hydraulics: skid-steers, articulating loaders, mobile cranes, excavators, log splitters, and other outdoor equipment requiring an HV-class ISO 46 fluid.
Stationary industrial: gear, vane, and piston pumps in machine tools, presses, and power units that call for Parker Hannifin (Denison) HF-0/HF-1/HF-2, Vickers I-286-S/M-2950-S, DIN 51524 Parts 2 and 3, or Cincinnati Milacron P-70.
Bronze and yellow-metal systems: pumps and valves with bronze metallurgy that demand a low-corrosion anti-wear formulation.
Selection by climate: match the right product with the ISO Hydraulic Oil Guide; use ISO 32 (HVH) where ambient temperatures stay cooler and ISO 68 (HVJ) where loads run hotter than typical ISO 46 service.
Pair every fluid change with a fresh AMSOIL hydraulic filter sized for the reservoir and rated for the working pressure. Avoid mixing with conventional hydraulic oils when possible, since dilution lowers the high-VI behavior and varnish-control performance that justify the synthetic. Aftermarket pour-point depressants, anti-wear boosters, and viscosity modifiers are not required and should not be added.
Typical technical properties
Property
Value
ISO Viscosity Grade (ASTM D2422)
46
Kinematic Viscosity at 100 degrees C, cSt (ASTM D445)
8.5
Kinematic Viscosity at 40 degrees C, cSt (ASTM D445)
Great product. I use amsoil for everything I own. Great company and products
By Eric on June 28, 2023.
Would recommend this to a friend.
Hydraulic oil great stuff
When it comes to oil I always use Amsoil because it’s the best. I have an excavator Yamnar VIO 40–5 and I order the hydraulic oil and it works very well
By Ivan on April 09, 2022.
Would recommend this to a friend.
BOB
Used this product in a air compressor that’s out in the cold worked awesome.
ISO 46 is the ISO Viscosity Grade for a hydraulic fluid that measures 46 cSt at 40 degrees C. The HVI grade measures 46.7 cSt at 40 degrees C and 8.5 cSt at 100 degrees C under ASTM D445, placing it in the most common viscosity bracket for general industrial and outdoor mobile hydraulic equipment.
What does the HV in multi-viscosity hydraulic oil refer to?
HV is the ISO classification for high-viscosity-index, anti-wear hydraulic fluids used where ambient temperature varies widely. The HVI grade carries a viscosity index of 161 under ASTM D2270, well above the HV-class threshold, supporting startup flow at low temperature without dropping to a thinner ISO grade.
How does ISO 46 compare to ISO 32 and ISO 68 in this product family?
ISO 32 (HVH) thins faster at temperature and suits cooler climates and lower-pressure systems; ISO 68 (HVJ) holds a thicker film at high heat for warmer climates or higher continuous loads. ISO 46 sits in the middle and is the default fill for most outdoor mobile hydraulics in temperate climates. Defer to the system builder's specified ISO grade.
Is the HVI grade compatible with bronze and other yellow metals?
Yes. The formulation passes the Copper Strip Corrosion Test at 1A under ASTM D130 (100 degrees C, 3 hours) and was validated through 608 hours in a Parker Hannifin (Denison) T6H20C Hybrid pump combining piston and vane elements, with only minor polishing and trace scratching at teardown.
Can it be mixed with conventional ISO 46 hydraulic fluid already in the reservoir?
The fluid is compatible with conventional and synthetic anti-wear hydraulic oils of the same ISO grade, but mixing dilutes the high-VI base oil performance and varnish-control additive package. For best results, drain the existing fluid, replace the filter, and refill with HVI.
Which OEM and industry specifications does the HVI grade meet?
The HVI grade meets Parker Hannifin (Denison) HF-0, HF-1, and HF-2; Vickers I-286-S and M-2950-S; DIN 51524 Parts 2 and 3; and Cincinnati Milacron P-70. Verify against the equipment service manual before topping off or converting an existing system.
How often should hydraulic oil be changed in a mobile machine running this fluid?
Drain intervals depend on duty cycle, ambient temperature, water and dirt ingress, and reservoir size. Follow the equipment builder's recommended interval and use periodic oil analysis to track viscosity, additive depletion, water content, and particulate count. The KRL stay-in-grade pass result and varnish-control chemistry support extended drains where analysis confirms continued serviceability.
