10W-40 CI-4 is a high-performance heavy-duty diesel engine oil produced with synthetic oil technology. It provides excellent performance in diesel engines operating with both low and high sulfur fuels. Recommended for all diesel engine applications, including turbocharged and low-emission diesel engines, trucks, buses, tractors, construction machinery, and generators. It ensures safe operation in all engines by preventing wear at high speeds and temperatures. It also provides excellent lubrication at low temperatures, offering superior protection and fuel economy. By keeping the engine clean, it enhances combustion efficiency and engine power.