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Analysis of Phos Retention in Sequence IIIG Oil Test

This case study presents an analysis of Phos retention at 20, 40, and 100 hours in Sequence IIIG oil test. The study demonstrates a simple and straightforward calculation method with excellent discrimination, highlighting its superiority over other parameters. The discrimination capability is compared to viscosity increase, camshaft wear, lifter wear, piston deposits, and concluded as the best discriminator among reference oils.

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Analysis of Phos Retention in Sequence IIIG Oil Test

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  1. Case Study: Sequence IIIG Phos Retention at 20, 40, 100 Hours Presented to ESCIT August 9, 2007 Midland, MI

  2. Summary • Analysis Performed on Submitted Reference Oil Data • Analysis of Percent Phos Retention at 20 Hours in IIIG • Simple and Straightforward Calculation • Excellent Discrimination • Better than Other IIIG Parameters (Reference Oils) • Better than 40 or 100 Hours • Percent Phos Retention at 40 and 100 Hours in IIIG • Complicated by Oil Consumption Issues • Added Variability Due to Oil Fill and Oil Fill Measurements • Phos Retention Calculation is an Approximation • Very, Very Good Discrimination • Better than Other IIIG Parameters (Reference Oils)

  3. Calculation of Phos Retention on Reference Oils • Sequence IIIG Test at xx Hour Drain • PRXX = (Caxx / Ca0)x(P0 / Pxx) • Due to Measurement Error in Elements PR>1 is Possible • It Appears that Lower PR is Associated with Higher OC • Reference Oil Data • 149 Submitted Results by Labs A, B, D, F, G • Three Reference Oils • TMC 434, SAE 5W-30, ~0.08 P • TMC 435, SAE 5W-20, ~0.08 P • TMC 438, SAE 5W-20, ~0.10 P

  4. How Good is the Discrimination at 20 Hours? • Model PR = f(Oil) with Lab as Random Effect • Repeatability and Reproducibility • Repeatability s = 0.0212 and r = 0.06 • Reproducibility s = 0.0217 and R = 0.0614 • 8 Unusual Observations from Model: NONE Removed • LS Mean 434 = 0.7721 • LS Mean 435 = 0.8552 • LS Mean 438 = 0.7982 • Discrimination as Calculated by: • D(Oil1,Oil2) = ((Difference in LS Means) / R) • D(434,435) = 1.3534 • D(434,438) = 0.4251 • D(435,438) = 0.9283

  5. How Good is the Discrimination? EXCELLENT • By Comparison to Other IIIG Test Parameters • Percent Viscosity Increase • D(434,435) = 0.3500 < 1.3534 • D(434,438) = 0.1375 < 0.4251 • D(435,438) = 0.4875 < 0.9283 • Average Camshaft plus Lifter Wear • D(434,435) = 0.0181 < 1.3534 • D(434,438) = 0.6866 > 0.4251 • D(435,438) = 0.6685 < 0.9283 • Weighted Piston Deposits • D(434,435) = 0.4151 < 1.3534 • D(434,438) = 0.5788 > 0.4251 • D(435,438) = 0.1637 < 0.9283

  6. How Good is the Discrimination Capability?

  7. How Good is the Discrimination Capability?

  8. Comparison of 20, 40 and 100 Hours

  9. Comparison of 20, 40, 100 Hours

  10. Conclusion • Percent Phos Retention at 20 Hours in IIIG • Simple to Calculate; No Complications • Excellent Oil Discrimination among Reference Oils • The Very Best Discriminator of Reference Oils Compared to IIIG Vis, WPD, ACLW, PR40, PR100 • Percent Phos Retention at 40 and 100 Hours • Easy to Calculate, but an Approximation Due to Oil Consumption Issues • Very Good Oil Discrimination among Reference Oils

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