Commercial-Grade Hydraulic Oil - ISO 68Product Code : HCG68TP-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 68 Commercial-Grade Hydraulic Oil.
AMSOIL ISO 68 Commercial-Grade Hydraulic Oil is the heaviest viscosity in the conventional Commercial-Grade anti-wear (AW) hydraulic fluid family, formulated for high- and low-pressure gear, vane, and piston systems running in hot ambient temperatures, under heavy continuous load, or with worn pump clearances. The ISO VG 68 grade fits paper-mill hydraulics, mining and quarry equipment, large industrial power units, hot-climate construction fleets, and stationary presses that need a thicker oil film at elevated operating temperatures.
Anti-wear protection at higher operating temperatures
Hot oil thins out, and hot reservoirs thin it further. The ISO 68 grade carries a 9.0 cSt kinematic viscosity at 100 C and 68.3 cSt at 40 C (ASTM D445), which holds a thicker hydrodynamic film over vane tips, gear flanks, and piston shoes than the lighter grades in the same family. The Four-Ball Wear Test scar measures 0.50 mm (ASTM D4172, 75 C, 1200 rpm, 40 kg, 1 hour), and the FZG A/8.3/90 fail load reaches stage 12, indicating strong load capacity under sustained high-pressure duty.
Oxidation, corrosion, and bronze compatibility
Continuous hot-running service drives oxidation and varnish faster than ambient-temperature operation. The base oil and inhibitor system are selected to slow that breakdown and keep valves, servos, and pilot circuits clean through extended use. The Copper Strip Corrosion result is 1A (ASTM D130, 100 C, 3 hours), indicating low impact on yellow metals, and the formula is qualified for hydraulic systems built with bronze metallurgy such as legacy industrial pumps and older mobile equipment.
Foam control and water separation
Air entrained in hydraulic oil cavitates pump inlets, makes cylinder motion spongy, and shortens seal life. The anti-foam package delivers a 0/0 result in all three sequences of ASTM D892. Demulsibility (ASTM D1401) separates 40 ml of oil from 40 ml of water with 0 ml emulsion in 20 minutes, allowing free water to settle for routine drain-off in mining, paper, and steel-mill installations where condensate is common.
Filterability and viscosity stability
Good filterability lets the additive package pass through fine hydraulic filters without dropping out or coating media, preserving filter beta ratios over the service interval. The viscosity index reads 106 (ASTM D2270), the flash point is 264 C (507 F) by COC (ASTM D92), and the pour point is -33 C (-27 F) (ASTM D97). The combined viscometrics suit indoor industrial service, stationary power units in heated plants, and mobile equipment in temperate to hot climates where the lighter ISO 32 and ISO 46 grades would shear too thin.
OEM specifications and industry approvals
AMSOIL ISO 68 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-69, and Parker HF-0, HF-1, and HF-2. These approvals cover the principal vane, gear, and piston pump specifications used across North American steel, paper, mining, and large-scale industrial hydraulic fleets.
Recommended applications and service intervals
The ISO VG 68 grade is the right selection where ambient and oil temperatures run hot, where pump clearances have widened with age, where load cycles run heavy and continuous, or where the equipment manufacturer specifies a 68 grade outright. Typical service includes paper-mill drive hydraulics, steel and aluminum mill hydraulics, mining and quarry equipment, large hydraulic power units, and stationary presses with vane or piston pumps.
Industrial and mobile hydraulic systems calling for AIST 126, ASTM D6158 HM/HP, ISO 11158 HL/HM, DIN ISO 51524, Bosch Rexroth RD/E 90235, Eaton, GM LS-2, Fives Cincinnati P-69, or Parker HF-0/HF-1/HF-2 at ISO VG 68.
Step down to AMSOIL ISO 46 Commercial-Grade for general industrial and mobile service in moderate ambient temperatures, or to AMSOIL ISO 32 Commercial-Grade for cold-start environments and machine-tool hydraulics that specify a 32 grade.
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 ISO 68 service, wider operating temperature range, longer drain intervals, and improved energy efficiency, step up to AMSOIL Synthetic Anti-Wear Hydraulic Oil ISO 68 (HVJ).
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. Pair with the equipment-specified hydraulic filter on the manufacturer change interval.
Typical technical properties
Property
Value
ISO Viscosity Grade (ASTM D2422)
68
Kinematic Viscosity at 100 C, cSt (ASTM D445)
9.0
Kinematic Viscosity at 40 C, cSt (ASTM D445)
68.3
Viscosity Index (ASTM D2270)
106
Flash Point, C (F), COC (ASTM D92)
264 (507)
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 68 Commercial-Grade Hydraulic Oil
AMSOIL ISO 68 Commercial-Grade Hydraulic Oil is available in 2.5 gallon jug (HCG68TP-EA), case of two 2.5 gallon jugs (HCG68TP-CA), and 55 gallon drum (HCG6855-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 68 Commercial-Grade Hydraulic Oil.
Frequently asked questions
What is ISO 68 hydraulic oil?
ISO 68 is a hydraulic fluid viscosity grade defined by ISO 3448. An ISO VG 68 oil has a kinematic viscosity of 68 cSt at 40 C, plus or minus 10 percent. AMSOIL ISO 68 Commercial-Grade Hydraulic Oil hits that band at 68.3 cSt and pairs it with anti-wear additives, oxidation inhibitors, anti-foam agents, and corrosion protection, making it the heaviest grade in the conventional Commercial-Grade AW family for high-temperature and heavy-load industrial hydraulic service.
What is ISO 68 hydraulic oil used for?
The ISO 68 grade serves high- and low-pressure gear, vane, and piston hydraulic systems on paper-mill drive units, steel and aluminum mill hydraulics, mining and quarry equipment, large industrial power units, and stationary presses. It covers equipment calling for ASTM D6158 HM, ISO 11158 HM, Eaton, Parker HF-series, GM LS-2, Fives Cincinnati P-69, and similar AW specifications at ISO VG 68.
When should ISO 68 be used instead of ISO 46?
ISO 68 is the right step up when the equipment manufacturer specifies a 68 grade, when ambient temperatures stay consistently hot, when reservoir oil temperatures climb above the operating range for ISO 46, when pump clearances have widened on older equipment, or when load cycles run heavy and continuous. The ISO Hydraulic Oil Guide covers viscosity-versus-temperature selection in more detail.
Can ISO 46 and ISO 68 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.
What weight is ISO 68 hydraulic oil?
Hydraulic oils are not labeled with SAE motor-oil weights. ISO 68 hydraulic oil has a kinematic viscosity of 68.3 cSt at 40 C and 9.0 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 68 Commercial-Grade Hydraulic Oil synthetic?
No. AMSOIL ISO 68 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 ISO 68 service, wider operating temperature range, and improved energy efficiency, step up to AMSOIL Synthetic Anti-Wear Hydraulic Oil ISO 68 (HVJ).
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.
