High mileage engines
AMSOIL does not designate a "high mileage oil". ZROD is designed for antique and high performance vehicles with flat tappet engines. It has the most zinc of all their oils, although others do have zinc. What you need is top quality motor oils. If your engine is using oil, a higher viscosity may be needed. Diesel oils are also OK for some gasoline engines . As you can tell, I am a strong believer in quality lubes and use AMSOIL in all my vehicles and equipment. Log on to the AMSOIL site and you can get all the information you need.