AMSOIL ISO 46 COMMERCIAL-GRADE HYDRAULIC OIL

AMSOIL ISO 46 Commercial-Grade Hydraulic Oil delivers reliable wear protection, corrosion resistance, and foam control for industrial and mobile hydraulic systems that consume high volumes of fluid and need a dependable, cost-effective oil.

Hydraulic systems in construction equipment, skid steers, log splitters, farm implements, and manufacturing machinery operate under constant pressure and temperature swings. Contamination, moisture ingress, and thermal stress break down lesser fluids, leading to sludge deposits in valves and solenoids, accelerated pump wear, and spongy, inefficient operation. Equipment with large-capacity hydraulic reservoirs compounds the cost of oil failure because you are replacing a lot of fluid when things go wrong.

STRONG WEAR PROTECTION FOR PUMPS AND MOTORS
Hydraulic pumps, especially vane and piston types, rely on a stable lubricant film to prevent metal-to-metal contact at high operating pressures. AMSOIL Commercial-Grade Hydraulic Oil is formulated with anti-wear additives that protect pumps, motors, valves, and other critical components. In ASTM D4172 Four-Ball Wear testing at 75°C, 1200 rpm, and 40 kg load, the ISO 46 formulation produced a wear scar of just 0.56 mm. It also achieves an FZG A/8.3/90 load stage fail rating of 12, indicating strong performance under heavy gear-loading conditions. Less wear translates directly to longer pump life and fewer unscheduled shutdowns.

FIGHTS SLUDGE AND MAINTAINS SYSTEM CLEANLINESS
Sludge and varnish deposits are the quiet killers of hydraulic efficiency. They restrict flow through narrow passages in proportional valves and solenoids, causing erratic operation and sluggish response. This formulation resists oxidation to keep the oil clean over its service life, maintaining the operability of pumps, valves, solenoids, and other tight-tolerance components. Good filterability further supports system cleanliness by allowing the oil to pass through filtration elements without blocking them or bypassing contaminants.

RESISTS FOAM TO GUARD AGAINST CAVITATION
Air entrainment in hydraulic fluid creates compressibility that robs the system of power and responsiveness. Worse, foam-induced cavitation can cause serious damage to pump internals. AMSOIL Commercial-Grade ISO 46 Hydraulic Oil scored 0/0 across all three sequences of the ASTM D892 Foam Characteristics test. That means zero foam tendency and zero foam stability under each test condition. The result is firm, consistent hydraulic response and reduced risk of cavitation damage in gear, vane, and piston pumps.

CORROSION RESISTANCE FOR LONG COMPONENT LIFE
Moisture contamination is common in hydraulic systems, particularly mobile equipment exposed to weather and temperature cycling. AMSOIL Commercial-Grade Hydraulic Oil scores a 1A rating on the ASTM D130 Copper Strip Corrosion test at 100°C, indicating minimal corrosive tendency toward yellow metals like bronze and brass found in pump bushings and valve bodies. It also demonstrates excellent water separation with ASTM D1401 Demulsibility results of 40-40-0 in 20 minutes for the ISO 46 grade, helping the system shed moisture quickly so it can be removed by filters or reservoir drains.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL ISO 46 Commercial-Grade Hydraulic Oil is suitable for use in high- and low-pressure gear, vane, and piston hydraulic systems, including those with bronze metallurgy. It meets or is suitable for the following specifications:

• ASTM D6158 (HM HP)
• ISO 11158 (HL HM)
• DIN ISO 51524 II
• Eaton E-FDGN-TB002-E
• Eaton Brochure 03-401-2010
• Bosch Rexroth RD/E 90235
• Parker HF-0, HF-1, HF-2
• Fives Cincinnati P-70
• GM LS-2
• AIST (U.S. Steel) 126

This broad spec coverage makes it a straightforward replacement in excavators, backhoes, hydraulic presses, injection molding machines, log splitters, and other equipment calling for an ISO 46 anti-wear hydraulic oil.

SERVICE LIFE
Follow the equipment manufacturer's recommended drain intervals or oil analysis results to determine change intervals. Systems operating in clean, temperature-controlled environments will typically see longer fluid life than mobile equipment exposed to high heat, moisture, and contamination.