Gulf Superfleet ULE series are premium performance heavy duty diesel engine oils meeting the latest API CK-4 service category and are specially developed for use in ultra low emission engines meeting the latest European and US emission standards. These oils address the unique needs of the latest engines and enhance the life of exhaust after treatment devices. These oils are formulated with state-of-the-art additive technology and severely hydroprocessed base oils to provide outstanding performance and overall protection having a potential to offer significantly extended drain intervals.