FUELUBE 15W40 4×4 Diesel Fully Synthetic is formulated to provide dependable protection and consistent performance for modern diesel engines. Its advanced synthetic formulation helps minimize engine wear, control sludge and deposits, and maintain effective lubrication under demanding conditions. The 15W-40 viscosity offers strong protection across a wide range of operating temperatures, making it suitable for heavy-duty applications, long-distance driving and high-load conditions. Designed to support engine cleanliness, durability and smooth operation, Fuelube 15W40 Diesel helps keep diesel engines performing reliably throughout their service life.