1. ‘ACEA European oil sequences 1996 for service-fill oils’, December 1995, pp. 3–4: gasoline engines.
2. ‘Evaluation of high-temperature deposits, ring sticking, and oil oxidation in gasoline engines’, CEC L-55-T-95, issue 2, May 1995.
3. Oxidation of motor oils at crankcase temperatures: further studies
4. ‘Test method for oxidation stability of gasoline automotive engine oils by thin-film oxygen uptake test (TFOUT)’, ASTM D 4742-88.