Lucas Semi-Synthetic Type F Automatic Transmission Fluid is blended from premium paraffinic and synthetic base oils (Groups II+ and Ill), with shear stable synthetic polymers and viscosity modifiers, combined with a high-quality additive package that includes anti-wear, anti-oxidants and corrosion inhibitors. It is not friction modified so the shift character is "sport" or "hard shift," ideal for racing or wherever a fast, positive shift is required.