AMSOIL ISO 68 100% SYNTHETIC MULTI-VISCOSITY HYDRAULIC OIL

AMSOIL ISO 68 100% Synthetic Multi-Viscosity Hydraulic Oil delivers year-round protection, varnish control and long fluid life for hydraulic systems that operate across wide temperature swings. Built on synthetic base oils and fortified with anti-varnish chemistry, it solves the most persistent problems in hydraulic equipment: deposit buildup, cold-weather sluggishness and premature component wear.

Hydraulic systems face a punishing combination of high operating temperatures, tight tolerances and constant pressure cycling. Heat breaks down conventional fluids, generating varnish and sludge that coat valve spools, restrict flow and cause erratic operation. In cold conditions, thick conventional hydraulic oil starves pumps at startup, creates dangerous pressure spikes and delays response. A single fluid needs to handle both extremes without losing its protective properties or fouling the system.

CONTROLS VARNISH AND KEEPS SYSTEMS CLEAN
Varnish is one of the biggest threats to hydraulic reliability. It coats servo valves, sticks proportional valves and degrades system response over time. AMSOIL Synthetic Multi-Viscosity Hydraulic Oil is fortified with anti-varnish additives that chemically react with the building blocks of varnish, inhibiting its formation before deposits can accumulate. In aluminum beaker oxidation testing, it resisted elevated heat and oxidation more effectively than a leading conventional ISO 68 hydraulic fluid. Clean systems mean fewer stuck valves, more consistent cycle times and longer intervals between fluid changes.

DELIVERS ALL-SEASON PERFORMANCE
Synthetic base oils give this hydraulic fluid a naturally wide operating temperature range. At 100°C, it maintains a kinematic viscosity of 11.2 cSt (ASTM D445), providing a strong lubricating film in hot conditions. At the other end of the spectrum, it flows at temperatures as low as -41°C (-42°F) per ASTM D97 pour point testing. That cold-weather fluidity means bearings and other components receive almost immediate lubrication at startup, reducing the pressure spikes and erratic actuator movement common with conventional fluids. Because the formulation does not rely on the waxes inherent to conventional base oils, it flows more readily in cold temperatures and reduces warm-up time, getting equipment productive faster. For operators running excavators, log splitters, skid steers and other outdoor hydraulic equipment through Minnesota winters and Texas summers alike, a single ISO 68 synthetic multi-viscosity hydraulic oil replaces the need for seasonal fluid swaps.

FIGHTS COMPONENT WEAR AND PROTECTS YELLOW METALS
The formulation uses a shear-stable viscosity modifier paired with the latest zinc-type anti-wear additives. It meets the stringent viscosity-retention requirements of Parker Hannifin (Denison) HF-0 and demonstrates excellent anti-wear performance and yellow metal compatibility in both standardized laboratory and pump manufacturer tests. After 608 hours of strenuous pump testing in a Parker Hannifin (Denison) T6H20C Hybrid pump, the piston shoes showed only moderate polishing and trace random scratches, while the vane pump cam ring exhibited only light polishing and trace scratching. A Four-Ball Wear Test scar diameter of just 0.41 mm (ASTM D4172, 40 kg, 1200 rpm, 75°C, 60 min.) confirms consistent anti-wear performance across the full viscosity range. Copper Strip Corrosion testing (ASTM D130) returned a 1A rating, the best possible result, verifying compatibility with bronze metallurgy found in pumps, bushings and valve bodies.

RESISTS FOAM AND SHEDS WATER
Foam in a hydraulic system causes spongy response, cavitation damage and accelerated oxidation. AMSOIL ISO 68 Synthetic Multi-Viscosity Hydraulic Oil controls foam across all three ASTM D892 test sequences, recording 0/0, 35/0, 0/0 (Sequences I, II and III respectively). Demulsibility testing per ASTM D1401 shows rapid water separation at 40-40-0 in 20 minutes, helping prevent the emulsion-related corrosion and microbial growth that shorten fluid life. Dielectric strength of 45 kV AC (ASTM D877) and a passing result in distilled and salt water rust testing (ASTM D665A and B) round out the fluid's ability to protect against moisture-related damage.

MAXIMIZES ENERGY EFFICIENCY
A viscosity index of 155 (ASTM D2270) means the oil's viscosity changes less across its operating temperature range compared to conventional monograde hydraulic fluids. The system doesn't waste energy pushing thick fluid through lines on cold mornings, and it doesn't lose protective film strength on hot afternoons. That translates to more consistent pump efficiency and lower energy consumption across the full duty cycle.

Specifications and Compatibility
AMSOIL ISO 68 Synthetic Multi-Viscosity Hydraulic Oil is suitable for high- and low-pressure gear, vane and piston stationary and mobile hydraulic systems, including those with bronze metallurgy. It meets or is suitable for use in applications requiring the following specifications:

• Parker Hannifin (Denison) HF-0, HF-1, HF-2
• Vickers I-286-S, M-2950-S
• DIN 51524 Parts 2 and 3
• Cincinnati Milacron P-69

Use in all types of applications requiring an ISO 68 anti-wear hydraulic oil. Also available in ISO 22, ISO 32 and ISO 46 viscosity grades for systems with different requirements.

Service Life
AMSOIL Synthetic Multi-Viscosity Hydraulic Oil's resistance to oxidation and thermal breakdown promotes maximum fluid life, extending drain intervals well beyond those of conventional hydraulic fluids. Monitor fluid condition through periodic oil analysis to determine optimal change intervals based on your specific operating conditions and equipment manufacturer recommendations.

Property	ISO 68 (HVJ)	Test Method
ISO VG	68	ASTM D2422
Kinematic Viscosity @ 100°C, cSt	11.2	ASTM D445
Kinematic Viscosity @ 40°C, cSt	68.5	ASTM D445
Viscosity Index	155	ASTM D2270
Flash Point, °C (°F)	252 (486)	ASTM D92
Fire Point, °C (°F)	270 (518)	ASTM D92
Pour Point, °C (°F)	-41 (-42)	ASTM D97
Four-Ball Wear Test (40 kg, 1200 rpm, 75°C, 60 min.)	0.41	ASTM D4172
Copper Strip Corrosion, 100°C, 3 hrs.	1A	ASTM D130
Foam (Seq. I, II, III)	0/0, 35/0, 0/0	ASTM D892
Demulsibility	40-40-0 (20)	ASTM D1401
Dielectric Strength, kV AC	45	ASTM D877
Seal Tests Elastomer SRE-NBR 1, 100°C, 168 hrs.	Pass	ASTM D471
Rust Testing, Distilled and Salt Water	Pass	ASTM D665A & B
KRL Shear Test, 15% Max KV loss, Stay-in-Grade	Pass	—