Journal
TRIBOLOGY INTERNATIONAL
Volume 161, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2021.107079
Keywords
Hydrocarbon based lubricants; Chemical degradation; Condition monitoring; Additives
Categories
Funding
- Austrian COMET Program via the Austrian Research Promotion Agency (FFG) [872176]
- Province of Niederosterreich
- Province of Vorarlberg
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Modern internal combustion engines require lower emissions, higher power density, and longer maintenance intervals. A field study on petrol and diesel vehicles found that long-range petrol vehicles displayed accelerated oil degradation compared to diesel vehicles, while short-range petrol vehicles showed even faster oil degradation and changes in viscosity due to fuel dilution. Diesel vehicles exhibited higher soot loading and more pronounced engine wear.
Requirements for modern internal combustion engines are lower emissions, higher power density and longer maintenance intervals. These trends increase the demands on engine components, including lubricants. In a field study of petrol and diesel vehicles, oil condition of 47 engine oils from 12 vehicles are correlated with fresh oil properties and operating conditions, i.e., trip length and speed. Long-range petrol vehicles displayed accelerated chemical oil degradation compared to diesel vehicles. An explanation for this behaviour is assumed to be the difference air-to-fuel ratio. Short-range petrol vehicles showed an even faster oil degradation and significant changes in oil viscosity due to fuel dilution. Diesel vehicles exhibited higher soot loading and more pronounced engine wear indicated by iron content in the oils.
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