Engine Lubricant
<p ><b>Motor oil</b> or <b>engine oil</b> is an <a href="http://en.wikipedia.org/wiki/Oil" title="Oil" >oil</a> used for <a href="http://en.wikipedia.org/wiki/Lubrication" title="Lubrication" >lubrication</a> of various <a href="http://en.wikipedia.org/wiki/Internal_combustion_engine" title="Internal combustion engine" >internal combustion engines</a>. The main function is to lubricate <a href="http://en.wikipedia.org/wiki/Moving_parts" title="Moving parts" >moving parts</a>; it also cleans, inhibits <a href="http://en.wikipedia.org/wiki/Corrosion" title="Corrosion" >corrosion</a>, improves sealing, and <a href="http://en.wikipedia.org/wiki/Engine_cooling" title="Engine cooling" class="mw-redirect" >cools the engine</a> by carrying <a href="http://en.wikipedia.org/wiki/Heat" title="Heat" >heat</a> away from moving parts.<sup id="cite_ref-0" class="reference" ><a href="http://en.wikipedia.org/wiki/Motor_oil#cite_note-0" >[1]</a></sup>
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Motor oils are derived from <a href="http://en.wikipedia.org/wiki/Petroleum" title="Petroleum" >petroleum-based</a> and non-petroleum-synthesized chemical compounds. Motor oils today are mainly blended by using base oils composed of <a href="http://en.wikipedia.org/wiki/Hydrocarbon" title="Hydrocarbon" >hydrocarbons</a>, polyalphaolefins (PAO), and polyinternal olefins<sup id="cite_ref-1" class="reference" ><a href="http://en.wikipedia.org/wiki/Motor_oil#cite_note-1" >[2]</a></sup> (PIO), thus <a href="http://en.wikipedia.org/wiki/Organic_compounds" title="Organic compounds" class="mw-redirect" >organic compounds</a> consisting entirely of <a href="http://en.wikipedia.org/wiki/Carbon" title="Carbon" >carbon</a> and <a href="http://en.wikipedia.org/wiki/Hydrogen" title="Hydrogen" >hydrogen</a>. The base oils of some high-performance motor oils however contain up to 20% by weight of <a href="http://en.wikipedia.org/wiki/Ester" title="Ester" >esters</a>.<sup id="cite_ref-2" class="reference" ><a href="http://en.wikipedia.org/wiki/Motor_oil#cite_note-2" >[3]</a></sup></p>