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The globalization has brought a proliferation of Diesel engines in different vehicles and countries. This submits the Diesel injector to increasingly stringent conditions. Increased engine power density, increased injection and combustion pressures and the variability of fuel quality and settings of the engine brake systems expose the injector to a high degree of severity that can directly impact your life time. This paper describes a study of these relevant factors and its effects on the temperature of injectors applied on different engines. Strategies for its optimization are discussed based on vehicles tests results. Comparisons between results of Europe and South America showed some similarities in the event of decompression engine brake. As for the exhaust engine brake (throttle model) Brazilian tests indicated higher temperature levels. This study was important to optimize the application of the injectors as well as its durability in the South American market.