Millers Oils Trident 5w40 is a full synthetic engine oil. Fully synthetic engine oils offer better viscosity under all conditions especially extreme temperatures (e.g. Cold starts). Fully synthetic oils reduce sludgeing, oil burnoff and the potential for oil passageway clogging all of which can damage your engine. Millers Oils Trident 5W40 is recommended for use in current and late model petrol and diesel cars where this type of advanced engine oil is called for by the manufacturer, especially modern high performance vehicles. It is also ideal for turbocharged engines.Viscosity stability at high temperatures, delivering reduced wear and tear on the engine and its componentsProvides easy starting and quick circulation of the oil even under very cold conditions reducing engine wearFormulated with technology to provide engine cleanliness and durabilityFull synthetic engine oils improve fuel economy, lower maintenance costs and maximize the drain interval which benefits the environment as