Reviews vary among different Slick 50 engine treatments, but Amazon.com and Wal-Mart customers give Slick 50 Recharged high mileage engine treatment generally positive reviews. Slick 50 Supercharged synthetic engine treatment also rates highly with Amazon.com customer reviewers.
As of January 2016, Slick 50 Recharged high mileage engine treatment receives five out of five stars in 10 Wal-Mart customer reviews and an average of 4.4 out of five stars in 41 Amazon.com reviews. Amazon.com reviewers say that their engines run smoother and more quietly after using this product. Many reviewers say Slick 50 products extend the engine life and that they use the product with every oil change.