MTHM High pressure Ash-free Anti-wear Hydraulic oil (MTHM) is a high quality ash-free compound additive refined with high viscosity index hydrofining base oil. High pressure ashless anti-wear hydraulic oil is a kind of high performance hydraulic oil, suitable for high pressure, high temperature, high load hydraulic system. It can maintain a stable working state under heavy load and high temperature, effectively extending the service life of the hydraulic system. Extend the life of pumps with silver, copper and silver-plated parts. At the same time, the hydraulic oil also has excellent hydrolytic stability, and can provide good protection when the system is subjected to a small amount of water pollution.