Royal Purple's Duralec Super Diesel Motor Oil is a full synthetic engine oil formulated for diesel engines with 2007–2010 emissions systems, including DPFs, EGR, SCR, and catalytic converters, compatible with ultra-low sulfur diesel. It provides high-temperature stability and low-temperature pumpability to minimize wear during cold starts, while extending drain intervals and protecting against corrosion. Designed for both North American and European diesel engines, Duralec Super supports fuel efficiency, maximizes component life, and helps maintain emissions compliance.