Royal Purple Max-Clean Fuel System Cleaner and Stabilizer 11722 20 Ounce

Used on my 2016 F-150 200k miles, wasn’t expecting much from a fuel cleaning product, BUT I did notice acceleration improvement. Bought more for wife’s Jeep and father’s Lincoln So YES, I would recommend.

Need a cleaner to clean from fuel tank to exhaust stroke? Boom, here you go. This is a great and strong product to really clean carbon deposits and the fuel system entirely. And protects for future. Easy to use and comes with a little funnel if you don’t have one. Good price and doesn't smell.

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

First off, let me start by saying: Wow, what a product. Good job, RP. With that being said, I purchased this product for my 2013 Civic Si - which I've been tuning for a a while now. I noticed that with a tune and modifications, it lost some MPG and I was barely seeing 260 miles per tank. So, I asked myself, "Is the extra power from the tune worth the loss in MPG?" I thought there had to be something out there to help. I tried several fuel system cleaners over the past 6-8 months, I used one every month (or four tanks) and they all seemed to do very little. I came across Royal Purple Max-Clean Fuel System cleaner - wow, what an improvement. I run on Shell's Nitrogen Enriched 93 Octane gasoline. It is only getting more and more expensive, so this is something I wanted to try in order to help save money in the long run, and I think I will. My first tank using RP's Fuel System Cleaner had 304 miles traveled, and I wasn't driving conservatively. Not only gas mileage, but performance peaked as well. When we tune, we see everything the computer in the vehicle records and we noticed a 2% top-end increase in performance at high RPM - that's incredible for less than $20. But the question remains, "how long will this last?" Would I recommend this product? Most definitely. This container is large enough for two tanks on my Si (it's a small 13 gallon tank). Remember to follow the instructions - don't just dump this stuff into your gas tank. You should see an improvement about half way through your first tank. Just keep an eye on the MPG. From what I can tell from data logs and tuning, this product should only be used once every 3-5 months (or 8-12 tanks of gasoline) but varies depending on driving style. Using too much of anything isn't good. So, why after all of that, did I only give this product a 4 out of 5? I gave it 4 stars out of 5 stars because of the container and its design. You can't just dump this stuff in some gas tanks on newer vehicles without making a mess. I did not have a funnel that fit into my gas tank, so I was forced to buy one in order to use this (another $5~ or so). My point being: You shouldn't have to purchase additional items to be able to use this. Other than that, it's a great product and definitely worth the investment. I'm not going to say you will see a huge improvement, but it does help. How much depends on your driving style, your vehicle, and what grade gasoline you use. EDIT 1: One month after use: So, it has been about 3 tanks since I've used this stuff. I have noticed that the first two tanks, MPG stayed up there, and now is beginning to decrease slightly. Although, my driving patterns aren't 100% consistent, so it's difficult to tell for certain. I do believe that this product works, and still recommend it once every 3 months or so. EDIT 2: (July 15th, 2015): So, it has been well over a year. I use this product at least once per season on my Si. Every time I do so, I feel the improvement. Still highly recommended. The improvements seem to last about a few weeks (or few tanks). I'm not sure about mixing other RP gasoline products (e.g. Max-Boost). Royal Purple products are the ONLY products that go into my vehicle.

I did not look at any of the inside items like the top of the pistons or the valve stems or anything like that but as far as performance, my vehicle which is a 17 suburban 1500 I got better gas mileage, and the engine certainly ran cleaner than it was. Hope some find this review helpful. I also use royal purple oil in several of my vehicles. I certainly like the brand. The product comes with an attachable fill tube, which makes getting it in the fuel tank a lot easier. Note: the deeper your fuel system inlet is the better off you’ll be so you don’t spill.

first time user on 2004 jeep, generac generator, Chain saws, pole saws worked on all smooth ides no pulsating extremely pleased

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

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.