Motor oil, or engine oil, is an oil used for lubrication of various internal combustion engines. While the main function is to lubricate moving parts, motor oil also cleans, inhibits corrosion, improves sealing and 
cools the engine by carrying heat away from moving parts. Dieter Klamann’s text provides extensive technical detail about motor oils.
Motor oils are derived from petroleum-based and non-petroleum synthesized chemical compounds. Motor oils are today mainly blended by using base oils composed of hydrocarbons (mineral, polyalphaolefins (PAO), polyinternal ofefins (PIO), thus organic compounds consisting entirely of carbon and hydrogen. The base oils of some high-performance motor oils contain up to 20 wt.-% of esters.
This motor oil tin sign makes a great gift.
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