Deposit formation on engine parts can lead a lubricant formulation to fail the certification test if excessive or mild deposits form in areas that receive heavy weighting in the score. Conversely, characterizing degradation products from engine oils is known to be a difficult task due to their complex physical and chemical nature. These compounds include carbonaceous deposits, primary and secondary degradation products from aging oils and additive depletion. The current study discusses the limitations of conventional characterization techniques and introduces new and innovative approaches engine oil degradation products. This was accomplished through a combination of post mortem analyses of in use engine parts and oils from field and laboratory studies wherein metal surfaces were exposed to practical lubricants in reactor systems, in combination with series of analytical characterization techniques.

Advanced characterzation methods for engine oil degradation products: Engine oils, additive depletion, carbonaceous deposits

244th National Meeting (2012)

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