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To evaluate the influence of FAME, which has poor oxidation stability, on engine oil performance, an engine test was conducted under large volumes of fuel dilution by post-injection. The test showed that detergent consumption and polymerization of FAME were accelerated in engine oil, causing a severe deterioration in piston cleanliness and sludge protection performance of engine oil.

A low sulfated ash (S.Ash) DL-1/C2 0W-30 diesel engine oil with improved fuel economy has been developed to meet the PM targets outlined in the Euro 5 emissions standards and to help achieve the voluntary European CO2 target of 140 g/km. The newly developed engine oil is an effective solution to the trilemma (triple probrem) of reliability (high detergency and high anti wear), low S.Ash, and fuel economy, achieving a fuel economy improvement of 2% and reducing CO2 emissions by 3 g/km.