Abstract
author describes the significance of the laboratory oxidation tests forlubricants and the bench tests with Japnese full scale engines of “Nissan”, “Isuzu”, “Dutsan”.and others with compared to Lauson and Caterpillor engine tests. He also reviewsthe development of motor engines and required octane number in Japan, and the relationbetween laboratory and road octane number. Then he points out some problems forevaluation on the performance of lubricants in motor cars and for motor gasoline octanenumber.
