ABSTRAC ABSTRACABSTRAC T This study aims to evaluate the oxidation stability and tribological characteristics of palm oil-based Trimethylolpropane (TMP) synthetic ester (Palm Methyl Ester (PME)) as a bio-lubricant. The synthesis process was carried out through two-stage transesterification using Trimethylolpropane (TMP) as reactant and sodium methoxide as catalyst, with variations in reaction …