We offer Starol 4T Diamond 20W 50 Engine oil that are of superior quality, long-drain multiviscosity engine oil suitable for all seasons. Contains shear stable Viscosity Index improver in addition to detergent/ dispersant, antioxidant and anti-wear additives. These engine oils ensure easy cold temperature starting and smooth high temperature performance. Starol 4T Diamond 20W 50 Engine oil is formulated to exceed API-SN performance level requirements.