Royal Purple 11723-6PK Max-Clean Fuel System Cleaner and Stabilizer - 20 oz. (Case of 6)

I recently used the Royal Purple Max-Clean Fuel System Cleaner and Stabilizer (11722) in my vehicle, and I'm thoroughly impressed with the results.First and foremost, this product is easy to use. The 20-ounce bottle is convenient and provides enough treatment for several applications. Adding it to my fuel tank was a simple task, and it mixed effortlessly with the gasoline.One of the standout features of Max-Clean is its effectiveness in cleaning the fuel system. After using it, I noticed a significant improvement in engine performance. My vehicle's acceleration became smoother, and there was a noticeable reduction in engine noise. It's clear that this product helps remove deposits and carbon buildup, optimizing fuel combustion.Additionally, Max-Clean acts as a stabilizer, which is particularly valuable if you have a vehicle that sits idle for extended periods or if you want to improve fuel quality in areas with inconsistent gasoline formulations. It helps prevent fuel system corrosion and keeps the fuel fresh, which can lead to better overall engine health.I appreciate that Max-Clean is suitable for use in both gasoline and diesel engines, making it a versatile choice for a wide range of vehicles.While it's not the cheapest fuel system cleaner on the market, the results it delivers are worth the investment. Improved fuel efficiency, smoother engine performance, and long-term fuel system protection make Royal Purple Max-Clean Fuel System Cleaner and Stabilizer a product I would highly recommend to anyone looking to maintain their vehicle's performance and reliability.

Another fine product! Very well priced! Arrived well packaged with no leakage issues. Thank you!

I bought a used 2002 Porsche Boxster with 133K miles for cheap with the check engine light on at the time. Seller stated that it was on when he bought it. The car ran fine so I bought it anyway, considering the price. I put this product in and filled the tank. Almost immediately the car was running smoother, and soon the CEL went out - and has not returned. I use this every winter just to stabilize the fuel as I live in a snowy climate and hardly ever drive it. Every spring it fires right up and runs great.

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.

Seen a bunch of videos recommending this detergent cleaner for the jets. Just had to change the coil just making sure the jets are good too. I really appreciated the long nozzle it comes with.

Scotty Kilmer recommended this product and so did the reviews on Amazon. This was the second bottle my daughter used in her '15 Toy Highlander, a month apart and she says there's a noticeable difference in the idle and performance. Her husband doesn't notice the diff. but, in my experience, this is very typical. I have customers describe run ability issues in my past and I've had excellent feedback that with various fuel system cleaners, an on the shelf remedy can sometimes be the issue. This Royal Purple, but the reviews are kind of epic!

Following the instructions helped my car run smoothly and utilized my mileage.

This is the best .