FUELUBE 15W40 4×4 DIESEL BLUE OIL SEMI SYNTHETIC is a high-performance diesel engine oil engineered for 4×4 vehicles operating under demanding on-road and off-road conditions. Its advanced semi-synthetic formulation provides excellent protection against wear, sludge, deposits, and thermal stress while maintaining reliable lubrication under heavy loads and high temperatures. Designed to support strong engine performance and durability, it helps keep critical components clean, reduce friction, and extend engine life. Ideal for 4×4 diesel engines built to tackle tough terrain, long journeys, and everyday driving.B