A new category of diesel engine oil, Delo 400 SD SAE 15W-30, addresses the growth of severe duty applications in on- and off-highway markets. The API CJ-4 formulation uses Chevron Products’ patent-pending Isosyn technology, developed with an eye to the demands of “severe duty” cycles. It suits advanced engines equipped with features like four-valve heads, super-charging, turbo-charging, direct injection, higher power density, intercooling, full electronic management of fuel and emissions systems, exhaust selective catalytic reduction, exhaust gas recirculation, and exhaust particulate filters.