Royal Purple 11723-6PK Max-Clean Fuel System Cleaner and Stabilizer - 20 oz (Case of 6)

Seems to be the Best

Well, i was skeptical, but the treatment works well ! Added 1 can to 20gals in my 2000 7.3 diesel van, and within the 1st 15mi noticed that when i tromp on it from a dead stop, the "black cloud" was about half as dense, and spewed out bout 1/2 the distance (til my speed and motor RPM picked up).... Added another can after i put 15 gals of bio-diesel ina almost empty tank.... "Black Cloud" of soot was still less than after 1st treatment and length of "cloud" was shorter (upon wicked acceleration)...FYI, i have a "performance chip" in it, which spools up the turbo quicker than stock programing.... I'm sold !!! Have not taken a "mileage" check yet, cause i added treatment both times without knowing how many gals i had in the tank.... Will fill her up , do the math, and report back at a later date.... (Lil background-my injectors were replaced 150k miles ago and was getting 16-17-18mpg on the highway-not pulling a trailer). Steve

quality

I have used this product on several occasions in the past, purchased from local auto parts store, and after waiting a reasonable time lapse I, unfortunately, have NOT experienced the alleged beneficial functionalities the manufacturer claims! Additionally, I was not approved to cancel or return this new, unopened product! I did find a better similar name-brand product that proved to be very effective and offered better functionalities at less money! Oh well, expensive lesson learned!

I have 2017 Nissan Sentra with 88000 miles on it and I averaged 32 5 miles to a gallon it has a indicator that lets me know what I get per miles after putting in the Royal Purple the instruction says I wouldn't see any difference until I ran it about 50 to 100 miles and they were definitely right after I ran 90 miles is when I notice the difference it went from 32.5 Mi to a gallon to 37.5 miles to a gallon which I consider pretty significant since I bought this car brand new it's never got mileage better than 32.5 so even though five miles per gallon doesn't sound like much it makes a big difference for the price that we're paying for gas now I definitely recommend it