1.1 ,This test method evaluates the oxidation stability of engine oils for gasoline automotive engines. This test, run at 160 ,°,C, utilizes a high pressure reactor pressurized with oxygen along with a metal catalyst package, a fuel catalyst, and water in a partial simulation of the conditions to which an oil may be subjected in a gasoline combustion engine. This test method can be used for engine oils with viscosity in the range from 4 ,mm²/s (cSt) to 21 ,mm²/s (cSt) at 100 ,°,C, including re-refined oils.