When sourcing Steyr engines (commonly produced under licenses or joint ventures like WD615 or WD618 series), you must prioritize Power Output (kW/HP) and Torque curves to ensure they meet your specific load requirements. Verify the Emission Standards (e.g., Euro II, III, IV, or V) as this determines legal compliance in your target market. Additionally, check the Cooling System type (water-cooled is standard) and the Aspiration method (Turbocharged Intercooled is preferred for high efficiency). Ensure the Cylinder Bore and Stroke dimensions match your existing machinery if you are performing a replacement.