A fluid datasheet claiming both wear resistance and oxidation stability is making two separate claims that need two separate tests -- one mechanical, one chemical -- and testing only one tells you nothing reliable about the other. Neometrix's Test Rig for Hydraulic Fluid runs both simultaneously on independent circuits rather than picking one.
The wear side runs to ASTM D6973 using a Vickers 35VQ25A-11*20 vane pump at 2,400 RPM as the load element itself, cycling through outlet pressures of 6.9, 13.8, and 20.7 MPa and oil temperatures of 52°C, 79°C, and 95°C -- a vane pump's cam ring and vanes wear measurably under poor lubrication, so mass loss from those specific components becomes a direct physical reading rather than an inferred one. The oxidation side runs to JCMAS P 045 on a completely different pump architecture, a bent-axis A2F10 axial piston pump at 350 bar design pressure, where the actual test mechanism is a copper catalyst plate plus controlled air dosing (0.1 L/h) and water dosing (up to 100 mL/h) -- reproducing the same heat, moisture, and catalytic-metal combination that drives real-world fluid aging, rather than just running fluid hot and calling it a day.
Automation is what makes the 500-hour JCMAS run practical: six samples up to 300 mL each get pulled without operator intervention, avoiding both the safety exposure and the repeatability problem of manually sampling a live high-pressure, high-temperature circuit. Data logging runs at 0.1-second resolution across both circuits throughout -- dense enough to pinpoint the actual onset of a gradual wear or oxidation trend rather than smoothing it out of the record.
Full writeup: https://neometrixgroup.com/products/test-rig-for-hydraulic-fluid
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