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Gasoline can oxidize during storage giving rise to formation of gums, which cause deposit formation in the intake system of engines, affecting the performance, derivability and emissions characteristics of the vehicles. To evaluate the deposit-forming tendency of gasoline, a small-scale engine test method using a modern technology gasoline engine, was developed and reported in SAE paper 2001-28-0039. Further work has been done in this area to demonstrate the ability of the test method to distinguish between different quality of fuels. Data on the performance of different base fuels and various commercial deposit control additives, with regard to their effect on the deposit forming propensity and cleanliness characteristics, in the engine combustion chamber and intake systems is reported. In order to investigate the effect of prolonged storage of gasoline on deposit forming tendency tests were conducted with base fuel samples stored over a period of two years.

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.