Shell Rotella T6 Full Synthetic 15W40 Motor Oil is formulated to provide advanced lubrication and reliable protection for heavy-duty diesel engines operating under demanding conditions. Its full synthetic formulation helps protect against engine wear, deposits, oxidation, and oil breakdown while supporting clean and dependable engine performance. The SAE 15W40 viscosity provides reliable lubrication across a range of operating temperatures and helps support protection during heavy-duty service. Supplied in a 5-gallon pail, it is well suited for trucks, commercial vehicles, fleets, heavy-duty equipment, and professional maintenance applications.