oil aging

Study on the Purification Process of Used Motor Oils in the Presence of Crystalline Urea

The paper deals with the results of the study on the purification process of used mineral and semi-synthetic motor oils in the presence of crystalline urea. The effect of the process main factors (the amount of the main reagent, time, and temperature) on the performance indicators of purified motor oils was studied. Used mineral and semi-synthetic motor oils for gasoline and diesel engines were purified under the established optimal conditions.

Study on the Properties of Semi-Synthetic Motor Oil Castrol 10W-40 after Use in a Diesel Engine

The changes in operational and physico-chemical properties of original and used semi-synthetic motor oil Castrol 10W-40 before and after its use in a diesel engine have been investigated. Derivatographic studies were carried out to examine a thermal stability; IR spectroscopy was used to confirm the presence of oil aging products. The composition of the inorganic part of the studied semi-synthetic oils was established by X-ray fluorescence analysis.

Change in properties of m-10dm mineral motor oil after its using in the diesel engine

Physico-chemical properties and group composition of the virgin and used M-10DM motor oil for diesel engines were studied. IR-spectroscopy and derivatography were used for investigation. By means of X-ray fluorescence the composition of inorganic part was determined. Change in properties and composition of M-10DM before and after using are discussed.