RESEARCH PAPER
Evaluation of engine oil foaming tendency under urban driving conditions
| 1 | Department of Industrial Commodity Science Cracow University of Economics Sienkiewicza 4, 30-033 Kraków, Poland |
| 2 | Department of Power Engineering and Transportation, Faculty of Production Engineering University of Life Sciences in Lublin Głęboka 28, 20-612 Lublin, Poland |
| 3 | Department of Technology and Automobile Transport Mendel University in Brno Zemědělská 1/1665, 613 00 Brno, Czech Republic |
Publication date: 2018-06-30
Eksploatacja i Niezawodność – Maintenance and Reliability 2018;20(2):229–235
KEYWORDS
ABSTRACT
The purpose of the article was to analyze the foaming tendency of engine oils used under excessive operating conditions. To
achieve this end, foaming characteristics were determined for 23 oil samples in three measurement sequences. Foaming tendency
was measured using the ASTM D 892 standard method, which consists in assessing foaming tendency of the liquid and foam stability. The cars used in the tests were uniform in terms of brand, type and operating conditions. The relationship between the mileage
of the cars tested and the volume as well as stability of foam in used engine oils were presented using scatter plots with regression
lines, correlation coefficient and 95% confidence interval. Based on the obtained results it was found that foaming tendency for
new oils is characterized by high variability. The strongest foaming tendency at 24°C and 93°C (Sequence I and II) was observed
for two out of five oil groups. Statistically significant differences were found between mileage and foaming tendency/foam stability
for individual oils tested.
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