Commercial-Grade Hydraulic Oil - ISO 46Product Code : HCG46TP-EA• Provides strong wear protection to protect pumps and motors • Resists corrosion for long component life• Fights sludge to help maintain the cleanliness and operability of pumps, valves, solenoids and other components• Provides good filterability for maximum fluid performance and life• Resists foam to guard against cavitation and promote efficient operation
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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 Commercial-Grade Hydraulic Oil.
AMSOIL ISO 46 Commercial-Grade Hydraulic Oil is an anti-wear (AW) industrial and mobile hydraulic fluid for high- and low-pressure gear, vane, and piston systems running in moderate to hot ambient conditions. The ISO VG 46 grade is the workhorse viscosity for most fixed and mobile equipment, and this oil targets fleets, shops, and contractors that need reliable wear protection, corrosion control, and clean valve operation at a commercial price point.
Anti-wear protection for pumps, motors, and valves
The formula is built on quality hydrotreated base oils blended with an anti-wear additive package that protects pumps, motors, valves, and other components against scuffing and adhesive wear. The Four-Ball Wear Test scar measures 0.56 mm at this viscosity (ASTM D4172, 75 C, 1200 rpm, 40 kg, 1 hour), and the FZG A/8.3/90 gear-wear test reports a load-stage fail at stage 12, indicating strong film strength in loaded vane and gear pumps. Hydraulic systems last as designed and unplanned downtime drops on mobile equipment, presses, and stationary power units.
Oxidation, corrosion, and sludge resistance
The formula resists oxidation so the fluid stays in service longer before varnish and sludge begin to interfere with valve response. The Copper Strip Corrosion result is 1A (ASTM D130, 100 C, 3 hours), indicating low impact on yellow metals, and the inhibitor package is rated for systems built with bronze metallurgy. Cleanliness around solenoids, servo valves, and pilot circuits stays consistent through normal service.
Foam control, air release, and water shedding
Aerated hydraulic oil cavitates pump inlets, causes spongy cylinder response, and accelerates seal wear. The anti-foam system delivers a 0/0 result in all three sequences of ASTM D892 at ISO 46, and the demulsibility test (ASTM D1401) separates 40 ml of oil from 40 ml of water with 0 ml emulsion in 20 minutes. Free water drops out at the reservoir bottom for routine drain-off, and pumps maintain pressure under load.
Filterability and viscosity stability
Good filterability allows the additive system to pass cleanly through fine hydraulic filters without dropping out or coating media, which preserves filter beta ratios and component cleanliness over the service interval. The kinematic viscosity reads 46.4 cSt at 40 C and 7.0 cSt at 100 C (ASTM D445), with a viscosity index of 106 (ASTM D2270). The flash point is 246 C (475 F) by COC (ASTM D92) and the pour point is -33 C (-27 F) (ASTM D97), making this grade suitable for indoor industrial use and outdoor mobile equipment in temperate to hot climates.
OEM specifications and industry approvals
AMSOIL ISO 46 Commercial-Grade Hydraulic Oil meets or exceeds the requirements of AIST (U.S. Steel) 126, ASTM D6158 HM HP, ISO 11158 HL HM, DIN ISO 51524 Type II, Bosch Rexroth RD/E 90235, Eaton E-FDGN-TB002-E and Eaton Brochure 03-401-2010, GM LS-2, Fives Cincinnati P-70, and Parker HF-0, HF-1, and HF-2. These approvals cover the bulk of vane, gear, and piston pump specifications used across North American industrial and mobile fleets.
Recommended applications and service intervals
AMSOIL ISO 46 Commercial-Grade Hydraulic Oil is recommended for high- and low-pressure gear, vane, and piston stationary and mobile hydraulic systems, including those built with bronze metallurgy, that require any of the listed specifications. The ISO VG 46 grade is the default selection for general industrial service, injection-molding presses, machine-tool hydraulics, hydraulic power units, log splitters, lifts, and most mobile construction, agricultural, and material-handling equipment.
Industrial and mobile hydraulic systems calling for AIST 126, ASTM D6158 HM/HP, ISO 11158 HL/HM, DIN ISO 51524, Bosch Rexroth, Eaton, GM LS-2, Fives Cincinnati P-70, or Parker HF-0/HF-1/HF-2 at ISO VG 46.
Step down to AMSOIL ISO 32 Commercial-Grade in cold-start environments or where the OEM specifies a 32 grade, and step up to ISO 68 for higher operating temperatures, heavier loads, or larger clearances.
Aviation hydraulic systems, automatic transmissions, brake systems, and applications calling for fire-resistant phosphate ester or water-glycol fluids are excluded.
For premium full-synthetic AW industrial service, longer change intervals, and a wider operating temperature range, step up to AMSOIL Synthetic Anti-Wear Hydraulic Oil at the equivalent ISO viscosity.
Drain intervals follow the equipment manufacturer schedule and oil-analysis trends rather than a fixed hour cap. Compatibility with other mineral-based AW hydraulic fluids in the same ISO grade is acceptable; mixing with high-zinc engine oils, automatic transmission fluid, or fire-resistant fluids is not. Aftermarket hydraulic additives are not recommended with this formula.
Typical technical properties
Property
Value
ISO Viscosity Grade (ASTM D2422)
46
Kinematic Viscosity at 100 C, cSt (ASTM D445)
7.0
Kinematic Viscosity at 40 C, cSt (ASTM D445)
46.4
Viscosity Index (ASTM D2270)
106
Flash Point, C (F), COC (ASTM D92)
246 (475)
Pour Point, C (F) (ASTM D97)
-33 (-27)
Four-Ball Wear Test scar, mm, 75 C, 1200 rpm, 40 kg, 1 hr (ASTM D4172)
Order AMSOIL ISO 46 Commercial-Grade Hydraulic Oil
AMSOIL ISO 46 Commercial-Grade Hydraulic Oil is available in 2.5 gallon jug (HCG46TP-EA), case of two 2.5 gallon jugs (HCG46TP-CA), and 55 gallon drum (HCG4655-EA). All AMSOIL lubricants are backed by the AMSOIL Limited Warranty. Match the right ISO viscosity grade and AW specification with the ISO Hydraulic Oil Guide, cross-check equipment application match with the AMSOIL Vehicle Lookup Guide, then order AMSOIL ISO 46 Commercial-Grade Hydraulic Oil.
Frequently asked questions
What is ISO 46 hydraulic oil?
ISO 46 is a hydraulic fluid viscosity grade defined by ISO 3448. An ISO VG 46 oil has a kinematic viscosity of 46 cSt at 40 C, plus or minus 10 percent. AMSOIL ISO 46 Commercial-Grade Hydraulic Oil hits that band at 46.4 cSt and pairs it with anti-wear additives, oxidation inhibitors, anti-foam agents, and corrosion protection, making it the most common general-purpose viscosity for industrial and mobile hydraulics.
What is ISO 46 hydraulic oil used for?
The ISO 46 grade serves high- and low-pressure gear, vane, and piston hydraulic systems on injection-molding presses, machine tools, hydraulic power units, log splitters, lifts, and most mobile construction, agricultural, and material-handling equipment in moderate to hot ambient temperatures. It covers equipment calling for ASTM D6158 HM, ISO 11158 HM, Eaton, Parker HF-series, GM LS-2, and similar AW specifications.
Is AW 46 hydraulic oil the same as ISO 46?
The two labels describe different things but often appear on the same fluid. ISO 46 refers to a viscosity grade of 46 cSt at 40 C. AW 46 refers to an anti-wear hydraulic oil at that viscosity grade. AMSOIL ISO 46 Commercial-Grade Hydraulic Oil is both: an AW-type hydraulic oil at ISO VG 46, meeting ASTM D6158 HM, ISO 11158 HM, and Parker HF-0, HF-1, and HF-2.
Can ISO 32 and ISO 46 hydraulic oil be mixed?
The two grades are chemically compatible when both are AW-type mineral hydraulic oils from the same family, and a small top-off will not damage the system. However, mixing changes the operating viscosity, which can affect pump efficiency, response time, and OEM specification compliance. The correct procedure is to drain and refill with the grade specified by the equipment manufacturer. The ISO Hydraulic Oil Guide covers viscosity selection across ISO 22, 32, 46, 68, and 100.
What weight is ISO 46 hydraulic oil?
Hydraulic oils are not labeled with SAE motor-oil weights. ISO 46 hydraulic oil has a kinematic viscosity of 46.4 cSt at 40 C and 7.0 cSt at 100 C in this product, with a viscosity index of 106. Equipment specifications call out an ISO VG number rather than an SAE weight, and matching the ISO grade in the equipment manual is more important than translating to an SAE equivalent.
Is AMSOIL ISO 46 Commercial-Grade Hydraulic Oil synthetic?
No. AMSOIL ISO 46 Commercial-Grade Hydraulic Oil is a hydrotreated mineral-based AW hydraulic oil built to deliver an optimal mix of price and protection for equipment that typically consumes high volumes of hydraulic fluid. For premium full-synthetic anti-wear industrial service and the widest operating temperature range, step up to AMSOIL Synthetic Anti-Wear Hydraulic Oil at the equivalent ISO viscosity grade.
Will using AMSOIL hydraulic oil affect the equipment warranty?
No. Using AMSOIL lubricants does not void a new equipment manufacturer warranty, and AMSOIL lubricants are backed by the AMSOIL Limited Warranty. Confirm the required OEM hydraulic specification with the ISO Hydraulic Oil Guide before changing fluids.
