K&N Performance+ Fuel System Cleaner: Restores Performance and Acceleration, 16 Ounce Bottle Treats up to 21 Gallons, 99-2050 , Black

I recently used the K&N Performance+ Fuel System Cleaner (99-2050) in my 2012 Holden VE Calais V8, which has a 6.0L V8 engine, using high-quality BP 98-octane fuel. I followed the instructions, adding the cleaner to a nearly empty tank before filling it up and driving on the highway. While driving, I noticed a brief period of engine shuddering, and the check engine light came on temporarily. After a short while, the issue resolved itself, the light turned off, and the engine returned to normal. I scanned the vehicle with a high-quality OBD-II scanner, and no error codes were found. I believe this might have been a temporary effect of the cleaner dislodging carbon deposits in the fuel system, as described in the product details. The vehicle now runs smoothly, and I appreciate the cleaner’s ability to restore performance, as advertised. However, the temporary shuddering and check engine light were concerning, and I’d suggest adding a note to the product instructions to warn users about potential temporary effects during the cleaning process. This could help others avoid worry. Overall, it’s a solid product, and I plan to use it again, but clearer guidance on such effects would improve the experience. Thank you for a quality product, and I hope this feedback helps improve customer communication!

works great, noticeably smoother ride after a few miles.

Great cleaner and quick delivery.

The K&N Performance+ Fuel System Cleaner promises to restore performance and acceleration by removing carbon buildup in your fuel system. Improved performance and acceleration: Many users report experiencing smoother operation, increased responsiveness, and even slightly improved fuel economy after using this product. Easy to use: Simply add the cleaner to your gas tank before filling up. Affordable: Compared to professional fuel system cleaning services, this product is a budget-friendly option. Wide compatibility: Works with most gasoline-powered vehicles, including direct and traditional fuel systems

I have a 17 years old car with minimal maintenance, so this fuel cleaner is cheap, so I tried it out. You basically just pour it into your gas tank before filling with gas, and then drive normally. As far as the functionality, it's hard to tell if anything is running better or it's just placebo. This car didn't have any major issues, so even if this product had the ability to fix them, I wouldn't be able to tell.