K&N Performance+ Octane Booster: Boosts Octane and Improves Engine Performance, 16 Ounce Bottle Treats up to 18 Gallons, 99-2020

I tried the K&N Performance+ Octane Booster in my car, and the difference was noticeable right away. • Improved Engine Response: Acceleration feels smoother and more powerful. • Reduces Knocking/Pinging: Keeps the engine running clean even with lower-quality fuel. • Easy to Use: One 16oz bottle treats up to 18 gallons—just pour and go. • Trusted Brand: K&N is well-known for high-performance automotive products, and this one delivers. • Peace of Mind: Helps protect the engine while maximizing fuel efficiency and power. Final Thoughts If you want a simple way to improve throttle response and overall engine performance, this octane booster is worth it. A must-have for anyone who wants to keep their car running at peak performance.

First of all, I have to admit that the product actually seems to work. I currently use it for 4 vehicles. Since one bottle is enough for 68 liters of gasoline, I have weighed it accordingly and calculated on the tank capacity of my vehicles. I originally bought it for my Yamaha Raptor to give it something beneficial, since here in Paraguay we have gasoline with 96+ octane maximum and I have the Big 3 installed on my Raptor. After seeing some videos on the internet where octane boosters were tested in cars on a dynamometer and a power increase of 3 to 6% was MEASURABLE, I thought: I'll try that too. A direct increase in performance I have now not necessarily felt. But the engine runs very well. Good response. Definitely not worse! Next was my Yamaha WR450F. Again, I must say, it definitely does not run worse. But since the bike has endless power anyway, I don't notice any "extreme" boost in power here either. What I have to say though: It has helped to optimize the combustion. The exhaust is much less sooty! Now my last experiment: We have 2 China scooters with 125cc and carburetor technology and the two parts run far from optimal. When cold, they hardly start at all and they smoke non-stop out of the exhaust. Despite several times disassemble carburetor and clean and adjust, nothing could be improved so far - and in the beginning, the scooters ran very well, without problems. Now the miracle! Again, I added the K&N octane booster and wow: after a warm-up and then full throttle and smooth driving for a few minutes no more smoking from the exhaust, no backfiring, no knocking. So far I have ALWAYS had problems with knocking with my scooter. Especially at full throttle and the heat here because the engine is only air cooled... But since I put the booster in I have not had one jerk, stutter, knock or misfire. Both vehicles run SIGNIFICANTLY better. Cold starting works much better now too! So in conclusion I can say, especially with carburetor technology and air-cooled engines and that in warm climates, the octane booster pays off!

My car was stumbling at idle. After I repaired the issue myself with a battery replacement. As I didn’t know the age of the spark plugs/ignition coils, I decided to replace all six. The old ones were in great shape, but my mind was set already. Knowing that there had to be a lot of carbon deposits, I wanted to “blow” them out whilst minimizing more build up at the same time. I have found out that I have no performance/mileage loss from using mid-grade with my first BMW E60, but I get 93 octane as my default. I added this booster to my full tank. I drove at highway speed for an extended period of time to break in the new plugs/coils. I was getting over the estimated mpg and it didn’t drop very much on surface roads! The car was a bit more responsive overall. Even without the new parts, I believe that the slight performance would have still occurred.

Some brands are way more expensive and not an inkling better. I does make your car run better for sure. Don't expect a new engine but if you are experiencing knocking or think you might have gotten a bad tank of gas it won't hurt you to try it.

I have used this product on 4 stroke motorcycles and hybrid vehicle with 89-90 octane fuel and let me tell you I am impressed because I have not felt any strange things in the engine, no vibrations, rattling or knocking, nothing at all, just make sure to provide the necessary amount and I recommend when the tank is almost empty so that it mixes very well with the fuel and enjoy that new octane and power.

This booster works great for vehicles when there is not a station around that supplies premium octane fuel. I have used it in my Audi several times and have had no issues. I always carry one in the car.

My scooter takes premium fuel. But we have no separate premium hose gas stations locally. The tank is on 1.3 gallons. Well before premium gas even fills the hose some other octane, depending on what was used last, will pump into the tank probably 1/3 to 1/2 tank, then the premium tops it off. No problem, I just up the juice with this booster. Works great. If I don't use that I can get some spark knocking in the engine on hills or hard acceleration.

Not sure about this stuff in my 05 ford explorer 4.0. I’ve used other additives in my fuel that made a difference in my acceleration and fuel mileage but this stuff not so much. Too expensive and not good quality. Won’t be buying anymore.

Noticeable increase in power in my supercharged v6