REXOIL DIAMOND PRO FE 5W-40 represents the next generation of fully synthetic engine oils, delivering unmatched protection and efficiency for modern gasoline and diesel engines. Crafted with cutting-edge additive technology and top-tier synthetic base oils, it is engineered to perform where conventional oils cannot — under extreme heat, cold, and high-load driving conditions. Its advanced MID-SAPS formulation ensures full compatibility with today’s sophisticated after-treatment systems such as DPF, GPF, and catalytic converters, protecting sensitive emission components while maintaining maximum engine output.