Chevron Havoline Synthetic Blend Motor Oil 5W-30, 6 Quart Smart Change Box with Deposit Shield Technology are premium quality automotive engine oils. All grades are formulated with high quality base stocks and contain detergent, dispersant, wear control, antioxidant, corrosion inhibitor, and foam suppressant additives. Multigrades contain a shear stable viscosity index improver. Their antiwear additives provide excellent wear protection of critical engine parts. A high level of dispersancy in Havoline Motor Oils with Deposit Shield Technology protects against deposit and sludge formation in stop-and-go driving and sustained high temperature operation, and protects against corrosion. Their excellent high temperature oxidation stability helps prevent viscosity increase and oil gelling in the crankcase. They help keep PCV systems clean to maintain smooth engine performance.