ElringKlinger AG has returned 269 percent to its investors in the last three years, making it the most profitable investment of all European suppliers during that period.
ElringKlinger, the world's leading manufacturer in gaskets and seals for diesel engines, is benefiting from western Europe's growing demand for diesel-powered cars.
Last year more than 30 percent of all the new cars bought in western Europe had a diesel powertrain.
The German supplier has also successfully turned around its loss-making Brazilian and Canadian operations. The group also is expanding in eastern Europe, Asia and North America.
Net profit increases
The company's sales grew 6 percent to E417 million last year while net profit rose 35 percent to more than E27 million.
ElringKlinger's operating margin reached 13.1 percent last year, and averaged 11.3 percent over the last three years, a level far above its competitors.
MGI Coutier returned 153 percent in the 12 months through May 31, compared with an average of 52 percent for Europe's auto suppliers.
One of Europe's leading suppliers of custom injection moulds, MGI Coutier nearly quadrupled its sales to E488.6 million from 1992 to 2002. Business with carmakers Renault and PSA/Peugeot-Citroen accounts for 70 percent of the French supplier's revenue.
MGI Coutier almost doubled its operating result last year to E23 million from E11 million in 2002.
The improvement comes from its expansion abroad.
MGI Coutier has targeted Asia, eastern Europe and Germany for growth. It has cut debt in half, to E66 million from E114 million in 2002. In 2004, MGI predicts profits will keep rising.