Shell Rotella T6 Full Synthetic 15W40 Motor Oil is formulated to provide advanced lubrication and protection for heavy-duty diesel engines operating under demanding conditions. Its full synthetic formulation helps protect against wear, deposits, oxidation, and oil breakdown while supporting clean and reliable engine performance. The SAE 15W40 viscosity provides dependable lubrication across a range of operating temperatures and helps support protection during heavy-duty service. Supplied as a case of 3 one-gallon containers, it is well suited for trucks, commercial vehicles, fleets, and professional maintenance applications.