Since environmental compliance has been recently required under strict regulations to prevent global warming, clean and fuel-efficient diesel engines that emit less CO2 and CO are more appreciated. The UNIKAS fuel filter UF/GF series removes water, metal chips and sludge, and contaminants included in fuel oil (light oil or A-heavy oil) to protect high-performance diesel engines from fuel system problems. In addition, electronic control using a common rail injection system has drastically improved the environmental performance of diesel engines; however, to make full use of the performance, much cleaner fuel oil is necessary. The UNIKAS fuel filter UF/GF series meets this request and will contribute to the prevalence of earth-friendly diesel engines.