Rislone 4747-12PK Super Concentrated Octane Booster, 6. Fluid_Ounces, 12 Pack , yellow

Bar's Leaks Rislone Super Concentrated Octane Booster is a targeted fuel additive designed to eliminate knock and ping while restoring lost performance. Low quality gasoline can cause timing retard and pre-ignition that rob engines of their intended output. Packaged as a 12-pack of 6-fluid-ounce bottles, this additive gives drivers a consistent way to manage fuel quality across repeated fill-ups.

At the center of this formulation is an antiknock blend containing the highest concentration of real MMT permitted for street driving. In typical use, the formula raises fuel octane by over 20 points, which translates to two whole rating numbers. Each bottle treats up to 20 gallons of gasoline, making it simple to dose an entire passenger car or light truck tank at the pump. The chemistry is fully compatible with unleaded gasoline, ethanol blends including E10, E15, and E85, as well as dedicated racing fuels. It operates safely in carbureted, fuel injected, direct injected, GTDI, supercharged, and turbocharged engines without damaging catalytic converters or oxygen sensors.

The physical bottle is shaped to resolve a frequent annoyance at the fuel station. Its neck design works in conventional gas doors, obstructed paths, and capless fuel systems without requiring a separate funnel adapter. Regarding trade-offs, buying a 12-pack requires an upfront commitment if you only wanted to test a single fill-up. Furthermore, because each bottle is measured for up to 20 gallons, owners of smaller tanks will need to calculate partial doses themselves, as the product listing does not state whether the bottle features graduation marks.

Verdict: This additive is an effective, practical solution for drivers dealing with pinging, knock, or inconsistent fuel quality in high compression or forced-induction engines. With broad fuel compatibility and safe operation around modern emissions sensors, it offers dependable protection across 12 full tanks of fuel.

• Package Count: 12 Pack
• Bottle Volume: 6 Fluid Ounces
• Treatment Ratio: One bottle treats up to 20 gallons of gasoline
• Octane Increase: Over 20 points or 2 rating numbers
• Active Component: Highest concentrate of real MMT allowed for street use
• Fuel Compatibility: Unleaded gasoline, ethanol E10, E15, E85, racing fuel
• Engine Compatibility: Fuel injected, direct injected, GTDI, carbureted, supercharged, turbo

A great fit if you:

• Drive a turbocharged, supercharged, or direct-injected vehicle that experiences pinging or knock from low quality gasoline.
• Own a car with a modern capless fuel filler neck and want an additive bottle that inserts without a funnel.
• Run ethanol mixtures like E10, E15, or E85 and need an antiknock additive that works across all of them.
• Prefer stocking up on a multi-pack so you have treatment on hand for numerous fill-ups throughout the year.

Consider something else if you:

• Only want to test a single treatment before deciding whether an octane additive solves your engine symptoms.
• Drive a vehicle with a tiny fuel tank where measuring out a 6-fluid-ounce bottle becomes impractical.

Confirm on the listing:

• Check whether your typical fuel tank fill volume falls at or near the 20-gallon single-bottle treatment capacity.
• Confirm that the multi-pack count matches your needs before ordering, as this listing provides a 12-pack bundle.
• Verify that your fuel type aligns with the supported options, including unleaded gasoline, ethanol blends, or racing fuel.
• Check that your powertrain matches the listed types, such as carbureted, fuel injected, GTDI, or forced induction.

How to compare your options: When evaluating fuel treatments, pay attention to the specific octane rating increase, fuel type compatibility, and emissions component safety. This product delivers a verified boost of over 20 points using street-legal MMT, protects factory catalytic converters and oxygen sensors, and fits capless filler necks directly without supplemental adapters.

Always consult the specific usage instructions printed on the container label before introducing the additive to your fuel system.

Pour one full 6-fluid-ounce bottle into an empty or nearly empty fuel tank right before pumping your fuel, which allows the incoming stream of up to 20 gallons to mix the additive thoroughly.

When using the bottle with a capless fuel filler, insert the spout firmly to trigger the internal spring door without forcing the neck.

Store the remaining sealed bottles upright in a secure, moderate temperature area away from direct heat so they are ready for future fill-ups.

Will this octane booster damage my catalytic converter or oxygen sensors?
No, the formula is specifically designed so that it will not harm catalytic converters or oxygen sensors.

Does this bottle pour directly into vehicles with capless fuel tanks?
Yes, the container is engineered to fit standard, obstructed, and capless gas tank openings without requiring an auxiliary funnel.

How much of an octane increase does this product provide?
Typical results show an octane increase of over 20 points, which is equivalent to two full octane rating numbers.

Can I use this treatment with ethanol-blended fuels or racing fuel?
Yes, it is formulated to work with unleaded gasoline, ethanol blends E10, E15, and E85, as well as racing fuel.

How many gallons does one bottle treat?
One 6-fluid-ounce bottle treats up to 20 gallons of fuel.