The CEC-SG-L-109 Bio-Diesel A reaction occurring when oxygen attacks petroleum fluids. Oxidation is accelerated by heat, light, metal catalysts, and the presence of water, acids, or solid contaminants. Oxidation leads to increased viscosity and deposit formation. Bench test is a laboratory test that investigates the effect that fuels with biodiesel content can have on the lubricant. The European Automobile Manufacturers Association (Association des Constructeurs Européens d'Automobiles). The primary automotive standards organization in the European Union, ACEA defines performance specifications for automotive lubricants. 2016 specification recognizes that is vitally important for engine lubricants to perform consistently through their drain interval in the presence of any additional challenges that biodiesel may present.