Comparative Study of Engine Oil Performance on CNG/Diesel Engines on an Urban Transport Fleet

Macián, Vicente; Tormos, Bernardo; Salavert, José Miguel; Gómez, Y. A.

doi:10.4271/2010-01-2100

Cited by 5 publications

(11 citation statements)

References 11 publications

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“…As observed, the degradation rate was higher in CNG engine oils as a consequence of the higher thermal stress put on those oils (8) , important when comparing the similar quality oils A and C, taking the differences between both engine types, presented in Table 1, into account.…”

Section: Resultsmentioning

confidence: 70%

Monitoring and analysing oil condition to generate maintenance savings: a case study in a CNG engine powered urban transport fleet

Tormos¹,

Olmeda²,

Gómez³

et al. 2013

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Section: Resultsmentioning

confidence: 70%

Monitoring and analysing oil condition to generate maintenance savings: a case study in a CNG engine powered urban transport fleet

Tormos¹,

Olmeda²,

Gómez³

et al. 2013

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“…Engine oils are probably more susceptible to oxidation than in other lubricant applications, considering the high oil temperatures reached in the piston area and resulting in the called "thin film oxidation" 15 , causing that CNG oils have a higher degradation rate than in diesel engines, as it has been observed in previous studies [1][2]16 . Oxidation effect due to oil temperature leads to important changes in the oil effectiveness as a lubricant such as: increasing the acidity of the oil 17 and increasing the viscosity 18 , among other changes in properties.…”

Section: Variables Affecting Oxidation Measurementsmentioning

confidence: 83%

“…Taking into account that oxidation is the most predominant reaction of a lubricant in service and as a consequence, it will be responsible for several lubricant related problems such as: increase in viscosity and acidification, additive depletion, and so on 1 . Therefore, controlling and monitoring oxidation level (and other related parameters) should be considered a priority in order to assure good machinery performance and reliability 2 .…”

Section: Introductionmentioning

confidence: 99%

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Proposal of an FTIR Methodology to Monitor Oxidation Level in Used Engine Oils: Effects of Thermal Degradation and Fuel Dilution

Macián

Tormos

Gómez

et al. 2012

Tribology Transactions

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This paper describes a particular procedure, based on ASTM D7214 and ASTM E 2412, which has been defined to improve oil oxidation quantification in used engine oils. Taking into account typical problems that can be found in this type of samples, thermal oxidation and fuel dilution, response on FT-IR spectra has been analyzed considering also the effect of oil formulation. Two special zones have been considered inside the typical wave number range for oxidation quantification, where those problems can be detected and assessed more easily. Zone A between 1,725 cm , where esters as main products for detection of fuel dilution problems when diesel engine is operating with biodiesel.

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“…Comparative studies between Diesel and CNG engine oils performance have shown accelerated oil oxidation and higher engine wear rate for some metals such as copper on CNG engines, as a consequence of higher stress suffered by those oils related with higher thermal stress . This situation has been observed on formulations recommended by the own engine manufacturer.…”

Section: Introductionmentioning

confidence: 95%

Findings from a fleet test on the performance of two engine oil formulations in automotive CNG engines

Macián

Tormos

Olmeda

et al. 2013

Lubrication Science

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This work presents a comparative assessment of engine oil performance on field test using urban transport vehicles powered by CNG engines using two different mineral oil formulations approved by engine manufacturer. The first one is considered as a baseline reference, and the second one is a higher quality formulation in terms of base-stock refining and additive content. Higher quality oil has shown a significant enhanced lubricant performance, leading to reach the oil drain interval defined by engine manufacturer on these engines without penalties in maintenance costs.In order to assess oil performance, an oil analysis program has been established for oil samples collected from vehicles operated under real service conditions in an urban transport fleet. Monitored parameters include: oxidation, nitration, aminic antioxidant additives depletion, anti-wear additives depletion, TAN, TBN and RUL number (as an estimation of antioxidant additive depletion including aminic and ZDDP).Results obtained in more than 90 samples from 15 different vehicles have shown higher degradation rates for low quality lubricant oil formulation. This deviation can be explained taking into account factors related with lower antioxidant additives content and lower thermal stability that can be mainly related with the base stock quality. This lower oil performance can be finally converted into higher vehicle maintenance cost and lower engine reliability

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Comparative Study of Engine Oil Performance on CNG/Diesel Engines on an Urban Transport Fleet

Cited by 5 publications

References 11 publications

Monitoring and analysing oil condition to generate maintenance savings: a case study in a CNG engine powered urban transport fleet

Monitoring and analysing oil condition to generate maintenance savings: a case study in a CNG engine powered urban transport fleet

Proposal of an FTIR Methodology to Monitor Oxidation Level in Used Engine Oils: Effects of Thermal Degradation and Fuel Dilution

Findings from a fleet test on the performance of two engine oil formulations in automotive CNG engines

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