Work

Experimental Studies of the Effect of Operating Time and Temperature on the Dynamic Viscosity of Engine Oils

Year: 2025

Type: article

Abstract: The research problem concerning oils used for lubricating piston combustion engines is still very current and important. The proper selection of oil and its properties have a significant impact on engine reliability and durability, their efficiency, effective operating parameters, fuel consumption, environmental impact, and the proper operation of the turbocharger and exhaust system. The work concerned determining the effect of temperature and operating time on the dynamic viscosity of oils: mineral, semi-synthetic, and synthetic, used in compression-ignition engines (diesel engines). Dynamic viscosity tests were conducted for new oils, after a mileage of seven thousand kilometers, and after a mileage of fifteen thousand kilometers. The range of temperature measurement conditions used was from 0 to 50 °C and the shear transmission rate was 1000 s−1. This range allows the oil to be preserved at low and medium temperatures, which are crucial for engine operation during start-up and short operating cycles. As the conducted studies showed, both temperature and operating time have a very large influence on the dynamic viscosity of oils. It was demonstrated that as the operating time of the oils in the engine increased, their dynamic viscosity decreased, and increasing the viscosity measurement temperature results in smaller absolute changes in it.

Source: Energies

DOI: 10.3390/en18246530

Authors: Agnieszka Leśniak, Dariusz Kurczyński, Grzegorz Wcisło

Institutions: Krakow University of Economics, Kielce University of Technology, University of Agriculture in Krakow

Language: English

Topic: Lubricants and Their Additives

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funders: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie, Politechnika Swietokrzyska w Kielcach