Aviation used-oil evaluation – Trend analysis
Used oil limits for viscosity, TAN, water and metals content are established by the engine OEM and can differ by engine model and service. Always consult with the OEM for advice on used oil limits and appropriate actions.
Most engines operating satisfactorily produce wear metal levels close to zero. Metals analysis, oil parameters, phosphorus measurements and engine parameters are all essential to assess the operating condition of both the jet engine oil system and the oil.
To learn more, please download the full technical topic below.
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Find answers to general ExxonMobil aviation questions or explore our other FAQ pages about jet turbine oils, hydraulic fluids, piston engine oils, greases and gear oils.