Full synthetic all-season all fleet heavy duty diesel and gasoline engine oil. Formulated with an advanced additive system, Duron-E Synthetic 10W-40 is designed to give premium soot dispersancy and extended drain performance (up to 3-4 times OEM standard intervals)*. It improves fuel economy through ease of start-up and lower viscous drag. It combines superior pumpability at - 35°C (5W grade requirement) with excellent engine wear control and oil top-up performance. DURON-E Synthetic 10W-40 meets the tighter high temperature physical property requirements of Mack Premium Plus specifications while meeting the shear stability requirements of APICJ-4.