505 CRF Fuel System Treatment, 16 fluid ounces

Item was a bit damaged & took longer than usual to arrive. I think it was due to bad weather. But I added 3/4 of the can to my 07 VW Mk5 a couple days ago. I haven't gave my car a tune up yet as I wanted to 1st add this to see the difference. I'm a 1st time user. Well my car would not start in mornings & occasionally when I start it but now soon as I crank it it starts. Also my motor feels much more responsive & much looser, smooth.! This stuff I was Leary about but it really made a drastic difference! My car has 195k. Feels like a newer modern vehicle as after installing all the suspension, front end steering & bearings then I waited to add this CRF solution, it really did make a huge improvement! My g- thought I gave it a tune up as I still haven't installed electric coils & plugs, doing next week. This stuff works!

Instant improvement, seriously.Scotty Kilmer on YouTube touted this - AND HE SPOKE THE TRUTH (as Scotty always does).This product is a game changer, and it doesn't wear off after the first 100 miles. My car has been getting better mpg for months.If you try one new thing this year, make it this stuff!!!!!!!!

Good product! Used this in conjuction with the cro oil treatment, smoother, quieter motor, with better power and acceleration and gas mileage. Pricey, but worth the money, especially on a high mileage car. (07 honda accord- 2.4L- 190k)

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.

It seems to be working well, my car wasn't having any issues so I just bought it to be proactive, but it seems to be working very well

So I drop this in my ford 150 and was shocked how much get up and go the truck had works very well....I would buy again!!

Used as a regular maintenance fuel system cleaner. Seems to have worked in less than one tankfull of gas. Engine runs smooth with more pep! What more would you want from a cleaner?

Exceptional fuel treatment for vehicles. Have used on Nissan Frontier with 50000 miles and Toyota Tacoma with 100000 miles. Try this before paying for fuel injector work.