They are highly refined mineral oils obtained through hydrotreating and hydroisomerization processes. They feature a high viscosity index (≥ 120), low sulfur content (< 0.03%), and excellent thermal and oxidative stability. They are transparent and crystalline in appearance, with low volatility and excellent performance at extreme temperatures. They are used as raw materials in the formulation of high-performance lubricants, modern engine oils, hydraulic fluids, greases, and industrial oils that require long service life and low maintenance. They meet API specifications for Group III base oils.