Technical Abstract: Seed oils are a renewable and environmentally friendly alternative to mineral base oils in lubrication and other important industrial applications. They are generally triesters (Triacylglycerols, TG) having a complex distribution of fatty acid (FA) chains. All the physical and chemical properties of seed oils are dependent on their FA distribution, composition and additional functional groups in the chain structure. In this work, the free energy of adsorption ('G(ads)) of cottonseed, canola, olive and meadowfoam oil is investigated in boundary lubrication regime using steel ball-on-disk geometry. Adsorption values were compared with monoesters with varying chain lengths. It was observed, based on computed 'G(ads), that molecular polarity, hydrocarbon chain length and relative distribution of unsaturation in the FA chain can affect adsorption on the metal surface. Statistical analysis on FA distribution and 'G(ads) was helpful in making a generalized assumption on adsorption behavior. The results are consistent with theoretical assumptions on surface adsorption as a function of molecular structure.