Petro-Canada DURON UHP 10W40 is an ultra high performance multigrade synthetic diesel engine oil designed for heavy duty applications. It exceeds ACEA E9 requirements, meets API CK-4 specifications and provides superior engine wear protection and extended drain intervals. Its excellent pumpability, shear stability, excellent engine wear control and low oil top-up frequency increase operating efficiency without compromising engine protection. The combination of 99.9% pure base oils and specialty additives in DURON UHP 10W-40 helps reduce downtime and improve engine reliability, resulting in improved fleet efficiency.