Use the Mystik ISO 68 JT9 LeakShield AW Hydraulic Oil. It's a premium-quality antiwear, antileak, and antifoam hydraulic oil formulated for use in modern high- and low-pressure industrial and mobile hydraulic systems. A fully synthetic seal swell agent prevents and stops minor leaks and provides longer seal life. Comes in a 2 gal. jug.

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Solvent-refined paraffinic, high viscosity index base oils with low pour points for wide temperature range applicability
Excellent oxidation resistance and thermal stability
Good water separation characteristics
Outstanding rust and corrosion inhibition for enhanced service life
Dyed green for ease of identification
Highly recommended for bearings and gears which require a rust and oxidation (R&O) or R&O/ AW hydraulic oil and hydraulic circuit components including valves, motors, servos, and pumps
May be used in applications involving general non-detergent type or R&O