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A sludge simulator
has been developed to clarify the formation mechanism
of the engine oil sludge and to reproduce it. The
simulator was designed so that synthetic gases consisting
of thermally decomposed products of gasoline(TDPG),
NO, SO2 and air were introduced into
the sample oil in a reaction vessel.
The sludge was found
to be almost caused by the chemical reaction among
TDPG, NO and air. The sludge formation was also
clarified to be largely dependent on the carbon
numbers and the molecular structures of hydrocarbons
in gasoline.
The dispersant additives
are blended into an engine oil to prevent the deposition
of sludge onto the engine inner wall. The performance
of the dispersant has usually been evaluated by
the standard engine test which is expensive and
timeconsuming. The new convenient method for the
dispersancy evaluation was realized by using the
sludge simulator. The result obtained from the new
method has a good correlation with that obtained
from the engine test.
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