10,11‐Dioctyleicosane, a star‐shaped hydrocarbon, has been successfully synthesized from 9‐octadecene (a product from metathesis of methyl oleate or ethyl oleate) through dimerization followed by hydrogenation. The product was determined by13C nuclear magnetic resonance spectroscopic and gas chromatography/mass spectrometric techniques. This hydrocarbon likely exhibits lubricating properties that can be used as high‐performance functional fluids in automotive lubrication. We also report the presence of a novel product, a trimer that was formed during the synthesis.