The polyamide blends are especially suitable for the production of injection-molded parts subject to high thermal and mechanical stress. Thanks to their high stiffness moldings made from reinforced grades are appropriate for substituting cast metal parts, and are significantly lighter than these. Moldings exhibit outstanding surface qualities in spite of their high glass fiber content. TROGAMID® BX compounds can be combined with various rubber mixtures to produce plastic-rubber composite parts that are resistant to fuel and oil.