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Using an indigenous gasoline engine of popular car, Maruti 800 in India, two dynamometer tests, namely Maruti IIID and Maruti IIIE have been developed as an alternate to the standard ASTM Sequence IIID/IIIE tests used for assessing high temperature thickening characteristics of crankcase engine oils. Various changes in engine hardware and operating conditions (blowby, speed/load, air to fuel ratio, ignition time etc) have been incorporated to achieve the adequate level of test severity to discriminate oil of different quality levels. An engine oil of API SF performance level has been used as reference oil for developing the Maruti tests. An attempt has been made to correlate the Maruti IIID/IIIE test with the ASTM Sequence IIID/IIIE test by generating data simultaneously on the Maruti and the ASTM test benches using four commercial engine oils of different performance levels.

India is having a large population of two stroke cycle engines. Before the advent of two stroke engine oils in India, motor oils were used to be mixed alongwith gasoline for two stroke engine lubrication for those vehicles having premixed type of lubrication system. The motor oils due to the high ash containing additives give rise to problems like pre-ignition, spark plug whiskering and combustion chamber deposits thereby leading to frequent breakdown of engines for maintenance. During the '8∅s the development of two stroke engine oils was taken up and the two stroke oils, confirming to ASTM/CEC standards, were introduced in the market. Due to the diversified designs of the two stroke engines owing their origin to both European and Japanese engine builders, it was felt necessary to have the Indian standards for two stroke engine oils comprising tests that incorporate both these types of engines.