Oxymethylen Ether (OME) is a promising alternative fuel for diesel engines. It can be produced sustainably, and its combustion is clean and efficient. This study investigates the effects of different OME$_{3-5}$ mixtures on emissions and combustion. The measurements were done on a four-cylinder common rail commercial diesel engine equipped with an exhaust gas recirculation system (EGR). Five different blends of OME$_{3-5}$ and B7 diesel were applied with 0, 7, 15, 25 and 45 vol%

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... nt at four loads. The NO$_{x}$–PM trade-off was investigated at 11 EGR rates for each mixture at each load. Increasing OME$_{3-5}$ mixing ratio reduced the PM emission, improved the NO$_{x}$–PM trade-off, and increased the brake thermal efficiency. The maximum achieved PM emission reduction was 86.8% for high loads. However, NO$_{x}$ emission increased, and also low heat capacity and viscosity can be a problem for real applications.