An automatic forced regeneration ceramic trap system with throttling before the trap, using Ce based fuel additives, for installation on light-duty diesel passenger cars is described. The system was installed on two vehicles and tested in the laboratory. The repeatability of the back pressure variation due to the soot accumulation during successive FTP cycles was determined, and the operation period of the system was defined. The operation of the system in both applications was equivalent to about 35 km of urban driving. The filtration efficiency approached 80% in FTP cycle and 90% in ECE and JAPAN 13 mode tests, while gaseous emissions and fuel consumption were practically not affected by the system.