Hertrich Hyundai of New Castle is your premier Hyundai dealership for the Wilmington and Newark area. We are located on South Dupont Highway in New Castle, DE. Come see us today and take care of all your vehicle needs. Our Service Technicians are ready and waiting to help! Hertrich Hyundai of New Castle is your premier Hyundai dealership for the Wilmington and Newark area. We are located on South Dupont Highway in New Castle, DE. Come see us today and take care of all your vehicle needs. Our Service Technicians are ready and waiting to help!