Gas chromatography–mass spectrometry (GC–MS) was used to monitor the thermo-oxidative degradation of the plain and additized mineral base oil (MBO) samples. Antioxidants used were MeOH extracts of the rice husk (RHE) and saw dust (SDE). The oxidation was performed for 6 h at 200 °C according to the modified Institute of Petroleum (IP) method. The results indicate that the additized MBO samples inhibited thermo-oxidation compared to the plain sample. Among the two antioxidants, the RHE showed excellent antioxidant potential compared to the SDE.

The antioxidant potential of methanolic extract of rice husk and sawdust in mineral base oil is investigated by FT-IR spectroscopy during oxidation at 100 and 200 °C. The Rice husk extract is found to be more efficient than saw dust extract.

This paper focuses on evaluating the potential of sawdust-derived antioxidants in oxidative stability of the lubricant oil samples monitored through gas chromatography−mass spectrometry (GC−MS). The plain and antioxidants-spiked oil samples were subjected to artificial aging at 100 °C for 6 h in a flow of air (10 L h −1 ). The results indicate that the antioxidants under study imparted thermo-oxidative stabilities to the oil compared to the plain sample and exhibited good antioxidants potential at 100 °C.

The thermo-oxidative stability of the mineral base oil (MBO) was examined by subjecting it to artificial aging process performed at different temperatures (25, 50, 100, 150, and 200°C) and times (00-24 h in cycles of 06 h). The MBO samples additized with the antioxidants under study were then oxidized under the optimized temperatures and time. The antioxidants were used in concentration range of 1-3 % (w/w). The extent of the degradation was estimated from the changes in the physico-chemical properties i.e. kinematic viscosity determined at 40 and 100°C, viscosity index, viscosity ratio, Conradson carbon residue, total acid number and iodine number in comparison with the un-oxidized plain oil. The results inferred that the antioxidants used in concentration of 3 % proved to be effective in avoiding the thermo-oxidative degradation of the MBO.

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