A field test method to quantitatively determine oxidation stability of gasoline engine oil

Wei, Lei; Duan, Haitao; Chen, Song; Jia, Dechang; Qian, Xuzheng; Cheng, Bingxue; Liu, Jianfang; Li, Jian

doi:10.1002/ls.1403

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…Motor oil provides wear protection, thermal management, and corrosion inhibition functions that are critical to engine performance and longevity [1,2]. Regardless of the oil type used, the quality declines during use because of degradation and/or contamination [3,4].…”

Section: Introductionmentioning

confidence: 99%

Motor oil degradation during urban cycle road tests

et al. 2020

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Several civilian vehicles in China operate in urban traffic conditions and have their motor oil changed every 5,000 km. This study investigates the variations in oil properties after servicing at 5,000 km, based on systematic road tests (including a repeated test, a parallel test, and a new vehicle test). The physicochemical properties, changes in components, oxidation stability, detergent-dispersant performance, and tribological properties of motor oils were analyzed. The results showed that the total acid number (TAN) of oils increased with the operation mileage, by up to 1.41 mgKOH/g. The total base number (TBN) decreased after the road tests were completed, and the decrease was less than 44.6%. The kinematic viscosity (KV) of most oils decreased initially and then stabilized in the middle stage, before starting to increase later in the experiment. The change in KV at 100 ℃ was less than 15.96%. The oxidation onset temperature (OOT) of the oils diminished gradually with the operation mileage. All OOT values of the used oils were higher than 210 ℃. A spot test indicated that the used oils retained their detergentdispersant performance to an appropriate extent. The four-ball wear scar diameters and friction coefficient of the used oils did not increase significantly after the road tests were completed. This study can serve as a reference for end-users when changing motor oils.

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Section: Introductionmentioning

confidence: 99%

Motor oil degradation during urban cycle road tests

et al. 2020

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“…The limiting comprehensive indicator of the oil properties (1.8854) and the driving parameters (0.0366) can be calculated with Eqs. 1and (2). The motor oil needs to be changed while the comprehensive indicator decreases to 0.0366.…”

Section: Resultsmentioning

confidence: 99%

Motor oil condition evaluation based on on-board diagnostic system

et al. 2018

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The condition of the motor oil in civilian cars is difficult to monitor; hence, we propose a method to evaluate the degree of degradation of motor oil using an on-board diagnostic (OBD) system. Three civilian cars and four motor oils (containing mineral oils and synthetic oils) were subjected to five groups of road tests under urban traffic and highway conditions. The operation information, oil service time, mileage, engine operation time, idle time of the engine, and number of start-ups of the engine were obtained using the proposed OBD system. Physiochemical properties and changes in the components of motor oils during road tests were analyzed in laboratory. The theoretical model of the comprehensive indicators of driving parameters and oil properties were established. The proposed method was successfully applied to different cars, motor oils, and operating conditions in road tests. All the theoretical models had high accuracy and precision. Herein, we provide a method to monitor the oil condition with real-time driving parameters and provide a reference for end users to change their motor oil reasonably.

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“…Consequently, the synthetic ester oil inevitably undergo thermal oxidation, especially under sustained high temperature. The transformation of molecular structures is detrimental to the performance of lubricating oils . Many studies have investigated the oxidation of hydrocarbon oils, and the free‐radical chain oxidation mechanism has been proposed .…”

Section: Introductionmentioning

confidence: 99%

“…The transformation of molecular structures is detrimental to the performance of lubricating oils. 6,7 Many studies have investigated the oxidation of hydrocarbon oils, and the free-radical chain oxidation mechanism has been proposed. [8][9][10][11][12] However, the oxidation process of ester linkages is different to that of hydrocarbons due to their unique characteristics, [13][14][15] and the oxidation mechanism of hydrocarbon oils does not satisfactorily explain the oxidation of synthetic ester oils.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the oxidation resistance of synthetic ester oils DOA and TDTM: Experimental evaluation and theoretical calculation

Jin

Duan

Wei

et al. 2019

Lubrication Science

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The oxidation behavior of the synthetic ester oils di‐isooctyl adipate (DOA) and tri‐isodecyl trimellitate (TDTM) was investigated by analysing the oxidation induction time and oxidation onset temperature via pressure differential scanning calorimetry tests, and the variation in viscosity after oven accelerated oxidation tests. Moreover, theoretical calculations of the fractional free volumes and oxygen diffusion coefficients of DOA and TDTM were performed, and atomistic‐scale insights into the oxidative mechanisms of both oils were proposed based on reactive molecular dynamic (RMD) simulations. Better oxidation resistance for TDTM was confirmed with experimental observations. RMD results indicated that the C―O bonds of the alcohol chain and ester group of DOA were susceptible to oxidation. However, only the dissociation of the C―O bond of the alcohol chain initiated the oxidation of TDTM. Additionally, more degradation fragments for DOA were identified, along with the formation of a polymerized product, while no large molecules formed for TDTM.

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A field test method to quantitatively determine oxidation stability of gasoline engine oil

Cited by 6 publications

References 17 publications

Motor oil degradation during urban cycle road tests

Motor oil degradation during urban cycle road tests

Motor oil condition evaluation based on on-board diagnostic system

Comparison of the oxidation resistance of synthetic ester oils DOA and TDTM: Experimental evaluation and theoretical calculation

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