Regional mandates for reduced exhaust emissions, sustainable over the useful lives of vehicles or equipment, are influencing diesel fuel compositions and engine designs. Laboratory and real-world examples are provided to illustrate that both fuel composition and engine design can impact injector deposit formation and injector spray-hole corrosion rates, with associated potentials for deterioration of emissions compliance. Potential impacts of poor lubricity fuels are also discussed. A field test in California of a deposit control additive in trucks with Cummins L10 engines is detailed, including measurements of transient cycle emissions performance using conventional and reformulated fuels.

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