Sunlube Diesel Engine Oil 15W-40 is a high-performance, heavy-duty lubricant developed for naturally aspirated and turbocharged diesel engines operating under severe conditions. It provides outstanding wear protection, superior oxidation stability, and effective control over piston cleanliness and bore polishing. Designed for mixed fleet applications, it performs exceptionally well in both diesel and gasoline engines, ensuring long service life, extended drain intervals, and reliable performance in all temperature conditions.