Deposition and Oil Deterioration Phenomena

Lubricating Oil Oxidation and Stabilisation

“…Diamond et al [44] found that S0 3 promoted piston deposits but not oil deterioration whereas the reverse was the case with N0 2 . Although the total oxy genates level was reduced by S0 2 and H 2 S0 4 , the oxygenates which were formed were of the insoluble resin type.…”

“…For example, Cloud and Blackwood [75] showed that piston deposits increased as the sulphur content of the fuel increased. None of these materials had any significant effect, although it was found that S0 3 , but not S0 2 , introduced with the intake manifold of a motored engine produced a very dirty engine [44,75]. Diamond et al [44] investigated the effects of various blow-by and exhaust components on piston deposits in a motored engine test, including formaldehyde, acrolein, acetic acid and N0 2 .…”