Summary of ASTM Activities on Low Temperature Engine Oil Pumpability

Stewart, R. M.; Shaub, Harold; Smith, M. F.; Selby, T. W.

doi:10.4271/821206

Cited by 15 publications

(1 citation statement)

References 8 publications

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“…(24)(25)(26)(27)(28)(29)(30)(31) The sensitivity of some oils to cool-down rate was found to be the reason for the failure of the MRV test to identify oils with poor low-temperature performance. (24)(25)(26)3) In 1987, MacAlpine and May reported that basestock pour points or residual wax contents% alone do not predict low-shear viscometric properties of formulated engine oils under slow-cool conditions. The wax composition was reported to be a key factor with both normal and non-normal paraffins contributing to low-temperature viscosity increases.…”

Section: B Background -mentioning

confidence: 99%

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Frame¹,

Montemayor²,

Owens³

1989

SAE Technical Paper Series

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Contract No. DAAK70-87-C-0043 AUG 2 31988 ! ' Approved for public release; distrioution unlimited H D~cernber 1987 07% % = Disclaimers The findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. Trade names cited in this report do not constitute an official endorsement or approval of the use of such commercial hardware or software.

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Section: B Background -mentioning

confidence: 99%

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Frame¹,

Montemayor²,

Owens³

1989

SAE Technical Paper Series

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Automatically Assessing Low-Temperature Low-Shear Viscometric Response of Engine Lubricants with Decreasing Temperature

Henderson¹,

Mastropierro²

2021

Journal of Testing and Evaluation

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Successful low-temperature operation of engines depends on the lubricant being able to flow to the oil pump. ASTM D5133, Standard Test Method for Low Temperature, Low Shear Rate, Viscosity/Temperature Dependence of Lubricating Oils Using a Temperature-Scanning Technique, is one of two tests the industry uses to assess whether the engine’s oil pump will be able to lift the lubricant from the sump at low temperatures. This test method requires several distinct steps to accomplish the required thermal conditioning. Accomplishing these steps in a consistent manner is necessary to minimize the variation in test results. Currently, ASTM D5133 has a repeatability of 16 % and a reproducibility of 29 %. This study demonstrates that automating the thermal conditioning steps yields better precision. Based on the samples tested, the automated procedure reduced the variability in test results by approximately 50 %. The data obtained show that the automated method provides a clearer distinction between lubricants whose flow properties were above the specification limit while having little impact on those at or below the specification limits. As a part of this study, the impact of small changes in shear rate was evaluated using the automatic procedure. Poor flow of lubricants at low temperatures can be due to the presence of wax crystals. ASTM D5133 uses a cylindrical rotor with a narrow gap between it and the stator, thus limiting crystal size. A portion of this study evaluates the impact of replacing the cylindrical rotor with a vane rotor. These measurements indicated that a vane rotor yields a stronger response for those samples with a test value greater than the specification limit but not those at or less than the limit.

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Chapter 19 | Passenger Car Engine Oil and Performance Testing

Shah¹,

Selby²

2018

Significance of Tests for Petroleum Products: 9th Edition

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Summary of ASTM Activities on Low Temperature Engine Oil Pumpability

Cited by 15 publications

References 8 publications

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Automatically Assessing Low-Temperature Low-Shear Viscometric Response of Engine Lubricants with Decreasing Temperature

Chapter 19 | Passenger Car Engine Oil and Performance Testing

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