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Gas and steam turbine extended service analysis

Suitability for continued use Varnish prediction Maximum service
Foam Test Sequence 1
Membrance Patch Colorimetry (MPC)
Particle Count
Particle Quantifier (PQ) Index
Rotation Pressure Vessel Oxidation Test (RPVOT)
RULER - Amine
RULER - Phenolic
Total Acid Number (TAN)
Viscosity at 40°C and 100°C
Viscosity Index
Water Vol % Karl Fischer (KF)


  • Included test
  • TAN in lieu of oxidation for select synthetic products

Analysis may vary by laboratory, product supplied or oil condition.

Sample frequency

Sample at OEM recommended frequency or, for general guidance, begin with: Quarterly.

Adjust frequency based on asset’s economic impact, operating environment, machine age, oil age or sample results trend.

For select gas and steam turbine lubricant products only. Contact your ExxonMobil representative for details.

Service profile