Nobody does it better. FSEG is a preferred aftermarket supplier of remanufactured diesel components that meet or exceed the original manufacturers’ specifications for performance and service life. Unlike repaired components, FSEG remanufactured components undergo a comprehensive process to make sure you receive optimum value. 12-month Warranty: Unlimited mileage! ISO 14001 (Environmental) and ISO/TS 16949 (Automotive) Certified.