Total Rubia TIR 7400 (15W-40)-4L is a high-grade, multi-grade diesel engine oil (CI-4/SL) known for excellent viscosity stability, soot/sludge control, anti-wear properties, and piston cleanliness, suitable for heavy-duty on-road (Euro 5 and older) and some off-highway applications. It protects against cylinder liner polishing and works under severe conditions.