Non-petroleum base stocks made from canola oil, rapeseed oil or sunflower oil. Short driving intervals and slow warm ups create acid in engine oil. These by-products of the combustion process can damage metal engine parts. Chemical additives are used in engine oil to neutralize these acids. The lowest temperature at which a vaporized oil will flash when exposed to high heat for flame.
Polar lubricant additives that lower friction and fill the pores of metal.
The slipperiness or lubricity of oils determines their ability to reach parts and stay in place to prevent wear. Oil's ability to pour at ultra-low temperatures solely by gravity. Oil's resistance to finding its way into the combustion chamber where harmful deposits can form. Depends on sheer stability, the ability of oil to remain stable, intact and functional under load. Man-made hydrocarbon molecules such as polyalphaolefins and polybutenes.