Oil for lubricating an internal-combustion engine(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "motor oil" in a sentence
"DMNB and motor oil were the volatile components of composition C-4, a plastic explosive manufactured in the United States and used by the military."
"The maker of rigid plastic bottles for products from juice to motor oil also revealed that the competing bid came from Reynolds Group Holdings Limited."
"The air carried the smell of decay; rotting food and motor oil and animal waste and old sweat mixed with the rich, loamy scent of mud and the sharp, stinging odor of — — metal."