Total Rubia TIR 7400 15W40 is a high-performance engine oil specifically designed for heavy-duty diesel engines used in trucks, buses, and other commercial vehicles. It provides excellent protection against wear, oxidation, and deposits, ensuring prolonged engine life and reliable performance even under severe operating conditions. Rubia TIR 7400 15W40 meets the specifications required by major engine manufacturers and is suitable for use in both turbocharged and naturally aspirated diesel engines.