OPTIMIZATION OF MOTOR OIL FORMULATIONS FOR HIGH-TEMPERATURE APPLICATIONS
Keywords:
engine oils, additives, oxidation, sedimentation, varnish deposits, carbonaceous particles.Abstract
In high-temperature operating zones, engine oil may either undergo complete combustion or form carbonaceous residues that tend to accumulate on metal surfaces. Varnish and deposit formation pose a particular risk to piston rings, as the accumulation of carbonaceous materials within the ring grooves reduces ring mobility and impairs sealing performance. To minimize or prevent deposit formation, engine oils are formulated with surface-active compounds known as detergent–dispersant additives. These additives function by loosening and removing deposits from component surfaces, dispersing insoluble particles into stable suspensions, and preventing their agglomeration, thereby maintaining engine cleanliness and operational efficiency.
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