TRIAX Synergy SRT 10W-40 is a full synthetic high mileage engine oil designed to help slow or eliminate the symptoms of worn engines such as knocking, loud tappets, oil leaks and consumption. It is formulated with high viscosity base oils and top tier anti-wear package to offer outstanding wear protection for critical engine parts. It is contains special viscosity stabilizers and detergents to help stop oil leaks, clean hydraulic lifters and prevent the buildup of harmful sludge. Its full synthetic chemistry assures an exceptionally long life and dramatically improved oxidation stability under high loads. As the other TRIAX Synergy SRT products, this High Mileage oil also contains out top notch friction modifiers to further reduce wear, protect pistons and turbo-chargers.