Rislone Cat Complete Fuel, Exhaust & Emissions System Cleaner 1-Pack — Concentrated, O2‑Sensor Safe

Rislone 4720 Cat Complete is a concentrated cleaner formulated to dissolve soot, carbon, oily residues and inorganic deposits across fuel, combustion, turbo, EGR, catalytic converter and oxygen sensor systems.

Vehicles accumulate carbon and soot from normal combustion, poor fuel quality, short trips and cold-weather operation. Rislone 4720 Cat Complete combines detergents and heavy-duty solvents with active agents that chemically react with combustion byproducts to lift and flush deposits, helping parts return closer to their intended performance. It’s designed for regular preventive use and targeted clean-ups on gasoline, ethanol and hybrid engines, and is compatible with common modern components like oxygen sensors and catalytic converters.

How will this cleaner affect my engine’s power and fuel economy?

Removing carbon, soot and oily deposits restores airflow and fuel spray patterns, which can recover lost power and improve fuel efficiency. Results depend on the extent of buildup, frequency of use and vehicle condition, but routine treatments help sustain factory-like operation.

• Restores injector spray and combustion chamber cleanliness
• Reduces exhaust restrictions from coked EGR and catalytic surfaces
• Helps maintain throttle response and mileage when used every ~5,000 miles

Is Rislone 4720 safe for modern emission controls and sensors?

The formula is engineered to be safe for oxygen sensors and catalytic converters and meets EPA compliance performance criteria. That means it can be used on vehicles with emission-control devices without voiding manufacturer warranties due to the cleaner itself.

• Specifically formulated to protect oxygen sensors
• Safe for catalytic converters when used as instructed
• Works across fuel-injected, direct-injected, turbocharged and carbureted systems

How do I use this product and what maintenance schedule is recommended?

Pour the recommended dose into the fuel tank at fill-up or follow label instructions for targeted cleaning cycles. Regular application every 5,000 miles is suggested to prevent heavy buildup and reduce the chance of check-engine lamp recurrence tied to contamination.

• Add to fuel tank during a fill-up for even distribution
• Use periodically as a preventive tune-up or when drivability issues appear
• Compatible with gasoline, ethanol blends and hybrid powertrains

What problems can this product help avoid or reduce?

By addressing deposits throughout the fuel, combustion and exhaust pathways, the cleaner helps combat common symptoms caused by buildup. It’s not a guaranteed cure for mechanical failure but can lower the risk of more costly repairs by maintaining system cleanliness.

• Can reduce rough idling, hesitation and hard starts related to contamination
• Helps prevent increased emissions and associated drivability issues
• May reduce premature wear from persistent deposits when used regularly

Who is this for: Rislone 4720 Cat Complete is aimed at drivers who want preventive maintenance and restoration of fuel, combustion and exhaust systems—DIYers, fleet managers, and anyone with gasoline, ethanol-blend or hybrid vehicles that show signs of deposit-related performance loss. It’s appropriate for owners of older cars with buildup and modern vehicles with emission controls who want to avoid costly component replacements by keeping systems clean between scheduled services.

Features include increased power and mileage, prevention of expensive repair needs, vehicle-warranty-safe formulation, broad engine compatibility, and the backing of a brand with decades in automotive care.