Gulf Supreme Duty XLE (CJ4) 15W40 (210L) is an extra high performance diesel engine oil specially developed for use in modern, high-output, low emission engines meeting US 2007 on-highway exhaust emission standards. It not only addresses the unique needs of these new engines and enhances the life of exhaust after treatment devices but also provides improved protection to older engines. It is formulated with state-of-the-art additive technology and severely hydroprocessed API group II base oils to provide outstanding performance and overall protection. It exceeds the performance requirements of API CJ-4, CI-4 PLUS, CH-4, CG-4, CF-4, SM, SL and SJ service categories and meets the latest performance requirements of major OEMs