Rislone Hy-per Fuel Complete Fuel System Cleaner Pack of 4 — Dual‑Cavity injector cleaner, stabilizer & octane booster

Rislone Hy-per Fuel Complete Fuel System Cleaner (Pack of 4) is an all-in-one gasoline additive that cleans injectors and the entire fuel system, adds lubrication, stabilizes fuel, and boosts octane and performance in one dual-cavity bottle.

This four-pack delivers concentrated treatment designed to simplify fuel maintenance: each dual-cavity bottle combines formulas equivalent to separate injector cleaner, complete fuel system cleaner, upper cylinder lubricant, fuel stabilizer and conditioner, dry gas, gas treatment and octane booster. The product is EPA registered and formulated for use in cars with catalytic converters and oxygen sensors. Use it periodically or during seasonal storage to help keep fuel fresh and the engine running smoothly.

How does this cleaner improve engine performance?

Rislone Hy-per Fuel works by dissolving and removing carbon, varnish and other deposits from injectors, intake valves and combustion chambers. Cleaner fuel passages and lubricated components help restore throttle response and can reduce knocking caused by poor combustion.

• Removes deposits from injectors and intake valves
• Boosts octane to reduce spark knock
• Provides upper-cylinder lubrication for smoother combustion

Will it protect my fuel during storage or long periods of inactivity?

Yes — the formula includes stabilizers and conditioners to help prevent fuel degradation and phase separation during storage. Adding the recommended dose before storing a vehicle can preserve fuel quality and make restarting easier after long idle periods.

• Contains fuel stabilizer to slow breakdown and oxidation
• Helps prevent water-related phase separation (dry gas effect)
• Useful for seasonal storage and infrequently used vehicles

Is this safe for modern emissions systems and warranties?

Rislone Hy-per Fuel is EPA registered and formulated to be safe for vehicles with catalytic converters and oxygen sensors. It is not known to void new vehicle warranties when used as directed, but always follow manufacturer recommendations and dosing instructions.

• EPA registered and compliant with performance criteria
• Designed to be safe with oxygen sensors and catalytic converters
• Universal fit for gasoline-powered cars

How often should I use this additive and how much per tank?

Follow the product label for exact dosing, but typical use is one dual-cavity bottle per full tank for cleaning and protection; periodic use every few fill-ups maintains benefits. For heavy deposit removal or older engines, a treatment cycle or follow-up applications may be recommended.

• Use one dual-cavity bottle per tank as directed
• Periodic maintenance every few fill-ups preserves cleanliness
• Multiple treatments may be used for older or high-deposit engines

Who is this for: Rislone Hy-per Fuel Complete Fuel System Cleaner is aimed at drivers who want a single, convenient solution for fuel-system maintenance — daily commuters, seasonal vehicle owners, mechanics who service gasoline cars, and hobbyists with stored equipment. The pack of four offers repeated treatments for routine upkeep, making it practical for households with multiple vehicles or for workshops that need an EPA-registered, multi-function fuel additive.