Royal Purple Duralec Ultra 10W30 Oil, API Service CI-4, 3 Gallons

Engine Protection – Royal Purple Duralec Ultra 10W30 motor oil delivers reliable lubrication and strength for heavy-duty applications including automotive, fleet, and industrial engines. Synerlec Additive Technology – Proprietary Synerlec formula bonds to metal surfaces for outstanding startup protection and strong oil film performance under demanding conditions. High Zinc/Phosphorus Formula – Fortified with enhanced ZDDP anti-wear additives to help guard internal components and extend engine part longevity. Fuel Efficiency & Clean Operation – Helps improve fuel economy while synthetic solvency keeps internal parts cleaner than standard detergent-only oils. Extended Drain Intervals – Advanced formulation resists breakdown, maintaining consistent protection and longer service life between oil changes.