Royal Purple Max-Clean Fuel System Cleaner and Stabilizer 11722 20 Ounce (Pack of 2)

WORKS GREAT, I PUT IT IN WITH 1/42TANK LEFT DROVE IT AROUND TILL 1/4 TANK FILLED IT UP GAINED 2 MPG

This might be the best of the three top fuel system cleaners I use: Royal Purple made an almost instant improvement in fuel economy and acceleration in two of my vehicles, one an 18 year-old mini-van with nearly 200K miles and the other a newer CUV with almost 100K miles with a turbo. I also use BG44K and Chevron Techron. I always read and was told that Chevron was the "gold standard" in fuel system/fuel injector cleaners, but now I'm not so sure.

Not much to say. Works as expected!

My family and I have been using Royal Purple Max Clean Synthetic Fuel System Cleaner & Stabilizer for about two years now, and it works great. My brother, who is very mechanically inclined, recommended it to me — and he hasn’t steered me wrong yet! The product itself does exactly what it claims, and we’ve been very happy with the results. My only complaint isn’t about the product, but about Amazon’s shipping. The first bottle I received was missing the funnel that is supposed to come attached, which meant I had to send it back and wait for a replacement. For that inconvenience, I’m giving four stars instead of five. Other than that, this is an excellent product, and I would absolutely recommend it.

My Honda Accord has been already smoother and more powerful with a bottle of Royal Purple Max-Clean Fuel System Cleaner and Stabilizer. Fully satisfied!

Excellent fuel treatment to clean carbon buildup off the Valves and Cylinder heads. Highly recommended by professionals in video comparisons. This won 2nd place but does almost as well as the 1st place product that required several steps. I am happy with it. Made my 2024 Honda CR-V and wife’s 2013 Honda Accord run and idle better. Son also claimed his 2019 Ford Fusion was helped also.

Make sure you fill your gas tank. It is good to 10 to 20 gallons

Pretty good system cleaner. I felt my car ran a bit better after using it, but no real way for me to verify it. I have an older vehicle with about 150,000 miles and it seems to have worked well. The applicator tube is a good length, so no spills. Recommended.

Fantastic product.

息つぎが改善され吹け上がりが良くなった。 アイドリングが少し安定してる。 キャブ車におすすめです♪

Pues parece que si funcionó bien, hay muchos productos como este sin embargo si noté que la camioneta recobró cierta potencia. Lo recomiendo

I noticed a more smooth engine performance when I applied the Royal Purple Max-Clean into my fuel. I am still watching out for further improvements as it will take some time to fully realise the benefits.

This product gave me 11% extra mileage but it didn't remove check engine light.