A Study of Gel Index and MRV Effects on SAE 5W-30 Pumpability

Koenitzer, BA; Lai, P. K. S.; May, CJ

doi:10.4271/982641

Cited by 6 publications

(1 citation statement)

References 5 publications

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“…Frequently, optimisation against one low-temperature specification leads to sub-optimal performance in another, a direct consequence of significant differences in the cooling rates and shear rate/shear stress regimes employed in the tests. 12 Buck and Lohuis carried out tests to assess the low-temperature start-up and pumping characteristics of both light and heavy vehicles with diesel engines using various oils. In their research, they included conventional mineral oils as well as hydrocracked and synthetic lubricants.…”

Section: Introductionmentioning

confidence: 99%

Cold cranking viscosity of used synthetic oils originating from vehicles operated under similar driving conditions

Wolak

Zając

2018

Advances in Mechanical Engineering

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This article assesses the performance and reduction level of five engine oils available from various manufacturers. The trend and intensity of the cranking viscosity changes as measured in the cold cranking simulator were thoroughly analysed. In the presented experiment, alterations in engine oils appearing during actual operation were noted. The tests were conducted under conditions which can be depicted as 'harsh', that is, multiplied starting of the engine, extended engine idling and short stretch driving. All of the engine oil samples were collected from passenger cars of a homogeneous fleet of 25 vehicles. The dynamic (cranking) viscosity was determined according to the ASTM D5293-15. In all analysed cases, there was a dangerously rapid increase (36%-69%) in the cranking viscosity, and the limit values (7000 mPaÁs) were reached very quickly (for the mileages in the range of 3000-13,000 km). The obtained results have led to the development of a statistical model, allowing vehicle users/drivers to choose a better engine oil in winter, thus improving the engine's ability to cold start and protecting it from excessive wear or damage. The test results may help to predict the performance of the engine oil during operation, its service life and an oil-change interval.

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Section: Introductionmentioning

confidence: 99%

Cold cranking viscosity of used synthetic oils originating from vehicles operated under similar driving conditions

Wolak

Zając

2018

Advances in Mechanical Engineering

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Low-Temperature Operation: Fuels and Lubricants for Cold Temperature Regions

Ramadhas

2022

Handbook of Thermal Management of Engines

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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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A Study of Gel Index and MRV Effects on SAE 5W-30 Pumpability

Cited by 6 publications

References 5 publications

Cold cranking viscosity of used synthetic oils originating from vehicles operated under similar driving conditions

Cold cranking viscosity of used synthetic oils originating from vehicles operated under similar driving conditions

Low-Temperature Operation: Fuels and Lubricants for Cold Temperature Regions

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

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