ATS Chemical 505 CRF Fuel System Treatment - 16 oz Powerful Carbon & Injector Cleaner for Gasoline & Diesel Engines - Help Boost MPG, Restore Power, & Reduce Emissions - Easy Pour Bottle

UPDATE: 06/06/2026, As promised, here is my update. This stuff works, I mean really works. I finally added this to my car at half a tank, drove fast and WOW, do I feel the difference. The car has so much more power now. It removed my rough idle and engine hesitation. It's all gone!! Seriously, this works. Amazing. I will add this in my car every year. It's well worth it. My idle in my car is rough in the mornings when I first start my car. I researched online for weeks to find a solution. I came across this product. My gas in the car is 8 years old because my car was in storage, and I cannot drain it out. This was recommended to me from YouTube, Scotty the car guy and from Royalty (Sherwood) auto care. They said they use it in many cars, and it works. It removes and cleans the carbon from the engine, injectors, fuel tank, valves, intake manifold, spark plugs, etc. I just bought it and will add it to my car soon. I know it will work especially for the price. It is very expensive. I read online that this stuff really helps with rough idle which I have in the mornings only. ATS does make the best treatments. I used them in the past. I will update my post once I use it.

I bought this product based on recommendations on YouTube by car mechanic Scotty Kilmer. I have a 2006 a Toyota 4Runner 4WD V6 Sport Efition with 198,428 miles on the odometer. I have always maintained it meticulously but as I neared the 200k mark I wanted to run something a lot stronger than the usual GUMOUT fuel cleaner to see if it might remove any deposits accumulated over 20 years of driving and further smooth out the idle on this engine. The bottle is a tad hard to open, so you should open it indoors first with whatever you need to open it without spilling any of this VERY EXPENSIVE cleaner. Then re-cap the bottle and take a clean automotive funnel with you to add it to a FULL TANK of premium gasoline. (I filled up with the Super grade of Chevron Techron gasoline.) Once I filled it up I let it sit and mix with the fuel overnight so it could already start cleaning deposits in the gas tank. The next day I went on a 280 mile highway road trip and I made sure I operated the engine at a variety of speeds and gears through the day with several 30+ minute runs at 3,000 to 3,500 steady R.P.M.’s. I also did some hard accelerations to simulate passing situations to try to blow out as much gunk as possible. The engine would rev up between 5,000 to 6,000 R.P.M.’s briefly as it downshifted to accelerate. I also did some low speed driving as well during that run. By the end of the day I burned up about 15 gallons of treated gasoline and it really did the trick. When I got home I re-filled the gas tank with Shell high octane premium gasoline and over the past week I’ve been well pleased with how smooth and responsive the engine performance feels and it seems to get smoother by the day. I also did an immediate oil change which I personally performed a few days after doing the 505 CSF treatment. This allowed any dissolved gunk to be drained out with the old oil. I then re-filled the engine with Royal Purple HSX High Mileage Premium synthetic oil and a reolaced the oil filter with a high-end WIX filter that is engineered to work well with synthetic oils. This is the proper way to go about things if you want to keep your high mileage engine running smoothly. It also helps to change oil religiously every 3,000 miles or 6-months, whichever comes first. Anything longer than that is a false economy that leads to premature engine wear and eventual expensive vehicle replacement. Take good care of you engine and you won’t regret it. I’m happy with the 505 product and would use it again if I felt it was necessary, but I sort of doubt it will be. One time use at 200,000 miles is just a great way to put a little pep back into a high mileage motor and to help extend its potential life a bit longer before a rebuild is warranted.

How I used the product: I poured entire contents of bottle into a 2012 Toyota Camry Hybrid XLE. The car had roughly 12-13 gallons of gas when I used it. I drove mostly normally, but used engine braking to increase rpm downhill or whenever possible. It took roughly 1.5 weeks for the fuel containing 505 CRF to be used. Why I purchased the product: I mainly purchased the product as a way to fix what I felt like was throttle lag. The acceleration felt weak. Fuel economy was also a consideration on the value of this product to me. My concerns: I was skeptical of this product working due to my car being hybrid. Within the past 2 years I have also changed my Hybrid battery and noticed better fuel economy with that, but performance was still lacking in my opinion. What I experienced with CRF 505: At first, I didn't notice any changes. Not for several days driving. The car still felt "squishy" as it had been. Then somewhere between 1/2 and 1/4 it starting feeling much more responsive. The acceleration is smooth, fast, and stronger than ever. The car went from being a bit of a chore to drive to becoming fun. It feels much safer to have the car be responsive to my controls. Gas economy(full transparency): I am sure many people that get product's first concern is if this will generate enough value from the save fuel economy. I don't have enough data currently to be conclusive due to several factors such as: I haven't had fuel filter cleaned, I haven't driven a full tank of since using the product, I rely on the mpg avg display which can be off several percentage(even -/+ 5% is the difference between ~4mpg in a Camry), and driving style(due to difference in acceleration driving is slightly more "aggressive". My opinion(Should you use it): I am more than happy with my purchase. The product did what I wanted it to do. The performance improvement alone is enough Value for the Money for me, and any fuel economy is just a bonus. I believe that if I had used it on 5-7 gallons of gas it would have probably helped the fuel economy more than me using it on >12 gallons. The only reason I would have to not buy the product again: It worked correctly the first time! Follow up plan: My follow up plan is to follow this up with occasional fuel treatment using Marvel's Mystery oil, and to pay attention to my mpg to see if any changes.

I bought this for a Hyundai Tucson which is known to consume oil and cause carbon buildup regularly. In October 2024 I went to Kia for their $700 engine clean out which did make it better but was still stuttering and consuming oil. I bought this in January 2025 and have drove the car 2,000 miles. The car has not hardly consumed any oil which the dealership said could happen with their product. This tells me this product has worked well cleaning the deposit buildup and the car has since ran smoothly. I can’t say it’s increased the MPGs much but it definitely worked. I also used it on my 2021 John Deere mower which was having a rough idle. It has also worked on it stopping it from revving while idling. The only problem I have with this product is the cap was broken from shipping and a couple ounces have seeped out. The company wouldn’t let me return it which was frustrating to pay so much per ounce and lose some of it. But still I highly recommend it and I will use again.

Expensive? Yes. Effective? Hell, yes! Tried in two different cars with 100K+ miles (Subaru Impreza, Honda CR-V). Restored throttle response and power to near new. You don't notice the very gradual performance degradation over many years. Highly recommend over what I used about 2X/year with the Chevron fuel treatment (best in its price class) though that would still be good for good maintenance..

item was as others said it was. i used this item and could tell it must have cleaned injectors because peddle respond was noticeably better on the low end of RPM range, i have to say that this is a 4.8L v-8 engine and i have put on all the 230,000 mile my self having purchased truck new from dealer myself. peddle response's mush more quicker then before as if injectors were cleaner and spraying fuel from them was better because i could notice quicker and responsive, it took very little applied pressure to peddle to get same movement of truck then before. hard to say about gas milage yet because from first gettin truck new it's always got good milage so will add to post when i've had more time to check that. having used other products before i can say this made a real noticeable difference then other products as they seem to not make a change so i can say i glad i found out about this product and would purchase again. great stuff

It’s only been a week but it worked great. My car was idling a little rough and my mpg was usually 25-26 mpg and it had went down to 20-21 mpg but after 1 day it’s back to normal and driving smooth. If it continues , i will make this part of my yearly maintenance.

It works great, my engine runs very smooth. The gas additive is great too.