Low Temperature Rheology of Soot-Laden, Heavy-Duty Engine Oils Using the Scanning Brookfield Technique

Selby, Theodore W.; McGeehan, J. A.

doi:10.4271/2006-01-3352

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…A previous study of diesel engine oils suggested that considerable gelation may form above -5°C [18,19] and this present study further supports those observations.…”

Section: Discussionsupporting

confidence: 92%

Thermal History of the Engine Oil and Its Effects on Low-Temperature Pumpability and Gelation Formation

Selby

Miiller²

2008

SAE Technical Paper Series

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Low-temperature engine oil pumpability has been a concern for OEMs, engine oil formulators, and additive manufacturers for a number of years particularly since a significant number of air-binding failures in 1980 and '81. On careful investigation of the cause of such field failures, it was found that oil sensitivity to a particular combination of weather conditions was responsible. The experience also suggested that many other lowtemperature weather conditions might produce enginedamaging gelation. Thus, it seemed desirable to develop a bench test that would induce and measure gelation that might form in engine oil by continuously measuring slowly cooling oil over an extensive lowtemperature range. This led to the development of the Scanning Brookfield Technique (SBT) first reported in 1982. Oil supply lines to Atmospheric Pressure 3 Oil pump Oil in sump valve-train and crankshaft 'Air-Binding' Process Oil Screen

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“…A previous study of diesel engine oils suggested that considerable gelation may form above -5°C [18,19] and this present study further supports those observations.…”

Section: Discussionsupporting

confidence: 92%

Thermal History of the Engine Oil and Its Effects on Low-Temperature Pumpability and Gelation Formation

Selby

Miiller²

2008

SAE Technical Paper Series

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Oil Degradation in a Diesel Engine with Dual-Loop Lubricating System

Plumley

Wong

Martins

2017

Tribology Transactions

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Advances in the Understanding of Gelation in the Framework of the Test ASTM D5133

Maroto-Centeno

Pérez-Gutiérrez

Quesada‐Pérez

2013

Journal of Testing and Evaluation

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This work presents a theoretical survey that sheds light on the physical meaning of the gelation index, that is, the main parameter involved in ASTM D5133. More specifically, it is proved that the pulse-shaped region of the gelation curve can be explained as the relief of the supersaturation of the solution, which is a nucleation process that finishes when the saturation ratio takes a value equal to 1. Comparison between experiments and the theoretical approach put forward in this work reveals qualitative agreement. This work also confirms the poor reproducibility of ASTM D4684, which is an alternative test for the evaluation of gelation in engine oils. Particularly, it is shown that the poor reproducibility of this test can be attributed to a systematic error made during the measurements. The lack of accuracy of the temperature, in particular the final test temperature, could be the main cause for discrepancies between laboratories. Finally, it is shown that in order to predict gelation within ASTM D5133, not only must the gelation index be considered, but the gelation index temperature also plays an important role.

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Low Temperature Rheology of Soot-Laden, Heavy-Duty Engine Oils Using the Scanning Brookfield Technique

Cited by 4 publications

References 10 publications

Thermal History of the Engine Oil and Its Effects on Low-Temperature Pumpability and Gelation Formation

Thermal History of the Engine Oil and Its Effects on Low-Temperature Pumpability and Gelation Formation

Oil Degradation in a Diesel Engine with Dual-Loop Lubricating System

Advances in the Understanding of Gelation in the Framework of the Test ASTM D5133

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