Mobil Delvac MX ESP 15W-40 is a high-performance, synthetic blend heavy-duty diesel engine oil designed to extend engine life in severe on- and off-highway applications. It provides exceptional performance in modern low-emission engines, including those equipped with Exhaust Gas Recirculation (EGR), Diesel Particulate Filters (DPF), and Selective Catalytic Reduction (SCR) systems. This oil offers excellent soot handling, wear protection, and deposit control, ensuring long engine life and maintaining emission system efficiency. It meets or exceeds API CK-4, CJ-4, CI-4 PLUS, CI-4, and CH-4 specifications, along with various OEM requirements.