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A method of rapidly evaluating high temperature detergency and anti oxidation propertyof engine oil is developed. It takes several minutes to distinguish base oil and high, middle or lowAPI quality grade engine oil. The method simulates the vanish formation of engine oil in piston. Inthis method, varnish forms on the surface of aluminum plate in 330±10℃ with test oil dropping onit. The detergency and anti oxidation property of engine oil are evaluated on the color of varnish.According to different practise application, two procedures are developed. Procedure a is for dis-tinguishing base oil and engine oil. Procedure b is for distinguishing engine oil of various API qual-ity grades, Also, this method is specifically suitable for discriminating poor quality engine oil inmarket.
A method of rapidly evaluating high temperature detergency and anti oxidation propertyof engine oil is developed. It takes several minutes to distinguish base oil and high, middle or low API quality engine oil. , varnish forms on the surface of aluminum plate in 330 ± 10 ° C with test oil dropping onit. The detergency and anti oxidation property of engine oil are evaluated on the color of varnish. Accredited to different practise application, two procedures are developed. Procedure a It is for dis-tinguishing base oil and engine oil. Procedure b is for distinguishing engine oil of various API qual-ity grades, Also, this method is specifically suitable for discriminating poor quality engine oil inmarket.