Autors: Tashev, A. M., Stoyanov, Y. S., Dobrev, G. L., Bakardzhiev, V. I., Mitev, P. V.
Title: VISCOSITY ANALYSIS OF ENGINE OILS USING A DESIGN OF EXPERIMENT APPROACH
Keywords: design of experiment, engine oil, viscosity measurements

Abstract: This study investigates the viscosity characteristics of three engine oil types (0W40, 5W40, and 10W40) at three distinct temperatures (–15, 25, and 50°C) using a systematic Design of Experiment (DoE) approach. Regression models is developed to describe the relationship between temperature and viscosity, achieving an R² of 98.73% and a predicted R² of 90.30%, which confirms the model’s robustness and predictive capability. The analysis reveals that viscosity increases sig-nificantly at sub-zero temperatures, with pronounced differences among the oil types due to their distinct low-temperature specifications. In contrast, at higher temperatures, the viscosity differences become minimal. These findings offer valuable insights into the thermal performance of engine oils and provide a basis for optimising their application under varying operational conditions.

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Issue

Journal of Environmental Protection and Ecology, vol. 26, pp. 2649-2655, 2025, Albania, ISSN 13115065

Вид: статия в списание, публикация в реферирано издание, индексирана в Scopus