New Royal Purple® MAX-PASS™ Cuts Emissions and Boosts Fuel Economy

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Introducing Royal Purple® MAX-PASS™, an advanced gasoline fuel additive engineered to help improve emissions system efficiency, reduce exhaust pollutants reduce tailpipe output, and protect sensitive emissions exhaust components from against fouling.

Over time, incomplete combustion leaves behind soot and carbon buildup that can foul sensors, clog catalytic converters, and trigger that frustrating “Check Engine” light. To see how well MAX-PASS™ solves this, we tested it in real-world vehicles under everyday driving conditions using calibrated, EPA-compliant emissions testing equipment.

The results speak for themselves:

  • 3% increase in fuel economy
  • 3.2% lower carbon dioxide emissions
  • 5.9% reduction in nitrogen oxides emissions
  • 40.6% decrease in particle number emissions

Beyond combustion efficiency, unburned fuel residues and soot are primary contributors to premature sensor contamination and catalyst deterioration. MAX-PASS™ delivers targeted chemical deposit control to protect the vehicle’s post-combustion hardware.

  • Catalyst Efficiency: Helps improve catalytic converter efficiency, prevents fouling, and associated check engine light.
  • Sensor Protection: Protects oxygen (O₂) sensors from fouling and preventing sensor-triggered trouble codes.
  • Inspection Readiness: Reduces tailpipe emissions to keep engines running cleaner and assist in passing state and local annual emissions inspections.
  • Fuel Savings: An extra mile per gallon means savings at the gas pump.

MAX-PASS™ offers easy, preventive maintenance that keeps your fuel system clean and your vehicle running at its best. MAX-PASS™ will be available in stores early next year.