I've used this stuff in the past, and DID notice that the engines in both my Sentra and Quest van ran smoother than before.
Also, in the first through 5th tanks of it, I got higher MPG's, but the returns gradually diminished over time.
Does this stuff really work, and if so, why would the MPG boost diminish over time?
Also, in the first through 5th tanks of it, I got higher MPG's, but the returns gradually diminished over time.
Does this stuff really work, and if so, why would the MPG boost diminish over time?