Delo® Gold Ultra SAE 15W-40 is a high-performance, multigrade heavy-duty diesel engine oil formulated to provide reliable lubrication and protection for a wide range of diesel engines requiring API CI-4 or ACEA E7 performance lubricants. It is suitable for engines equipped with modern emission-control technologies, including Selective Catalytic Reduction (SCR) and/or Exhaust Gas Recirculation (EGR) systems.