What does this mean?
More top products to consider
Transparency is key. This page may contain affiliate links. Find out how we make money.
Ask Fakespot Chat questions about this productAlpha
Initializing Fakespot Chat
System error,
Add detailed feedback
Message
Loading suggested questions
Suggested Questions
Suggested Questions
No suggested questions were found
Pros & Cons
pros
See Details
pros
See Details
Mpg Improvement
Customers have reported significant improvement in miles per gallon (2-4 mpg) after using this fuel system treatment, resulting in noticeable savings at the pump and improved engine performance. Some users also mentioned additional benefits such as smoother idling, better throttle response, and reduced RPMs. However, a few customers did not experience any improvement in their vehicle's fuel economy.
neutral
See Details
neutral
See Details
Engine Smoothness
Customers have generally positive feedback regarding the engine smoothness of the product, with some mentioning noticeable improvements in acceleration and fuel gauge accuracy. A few customers reported that their older vehicles ran smoother after using the treatment, while some mentioned the price being worth it for the improvement in engine performance. However, a small group of customers did not specify any change in engine smoothness but were satisfied with the product overall.
Fuel Injector Service
Customers have had positive experiences with using 500 CRF Fuel System Treatment for servicing their fuel injectors, reporting clean injectors and improved engine performance. However, some users mentioned encountering clogged injectors prior to use and the need for regular application to maintain optimal results.
Highlights
Quality
This made my fuel gauge accurate again and theres a noticeable smoothness of the engine.
It definitely improved the pickup and ran smoother.
It has nearly 200k miles on it, and it never had been carbon cleaned.
It's gotten my 1999 chevy s10 pickup running smoother
Price
Bit the bullet, spent the almost $50 bucks w tax, poured it into my half tank of fuel and crossed my fingers.
Given the dealer alternative to for an injector service this product is nearly half the cost of said service.
Decided to try 505, although a bit pricey.
It is pricey, but you get what you pay for.
Packaging/appearance
Great product, but packaging is very difficult to open.
Competitiveness
This is a much better and quicker alternative!
A bit pricey compared to other options out there, but it works great!
I will come back and update by 2026cleans better than gumout, that's for sure.
Instead of replacing it which is a long and more expensive job i'm trying this.
Overview
- How are reviewers describing this item?
better, additive, great and every. - Our engine has profiled the reviewer patterns and has determined that there is minimal deception involved.
- Our engine has detected that Amazon has altered, modified or removed reviews from this listing. We approximate total reviews altered up to 7.
- Our engine has discovered that over 80% high quality reviews are present.
- This product had a total of 359 reviews as of our last analysis date on Mar 26 2025.
Helpful InsightsBETA
Posted by a reviewer on Amazon
My fuel economy didnt necessarily improve but this additive noticeably quieted my ticking lifters and reduced the piston slap on 2
Posted by a reviewer on Amazon
Two of the bottles haft to have the cap cut off couldn’t be opened by turning the lock cap
Posted by a reviewer on Amazon
It is pricey but you get what you pay for
Posted by a reviewer on Amazon
He just called and it was less than a quarter tank to get there and this is only the second fill up after using this amazing product
Posted by a reviewer on Amazon
I seen this advertise on the scotty kilmore video on youtube so i decide to try it
Posted by a reviewer on Amazon
I’ve used the other cleaners and saw some improvements but none so drastic as the 505
Posted by a reviewer on Amazon
My average mpg in my old honda crv went from 16
Posted by a reviewer on Amazon
It has nearly 200k miles on it and it never had been carbon cleaned
Review Count History
Price History
Ask Fakespot Chat questions about this productAlpha
Initializing Fakespot Chat
System error,
Add detailed feedback
Message
Loading suggested questions
Suggested Questions
Suggested Questions
No suggested questions were found
Add Fakespot to your browser, Secure Shopping on the go.
Download Fakespot for Browsers
