Rated 4.0 out of 5 by 2
Rated 5.0 out of 5.0 by Dale Running clean
I have an older car that the engine was replaced after 200,000 miles. No one knew how many miles were on the replacement engine, it ran good before, it purrs like a kitten now. Gumout is a brand I've trusted for years.
April 28, 2015
Rated 3.0 out of 5.0 by PaulCoMat Not sure how effective
OK, I am not sure just how effective it is. All things considered my MPG was the same. I followed directions. After I added it I noticed lost power and I figured it was the cleaning action. I have a 2007 4 cyl. SUV with 95000 miles and during the cleaning tank I often punched it hard and let it rev up good under power. I waited till the tank was nearly empty and filled it again, this time at the start of a road trip. We drove 550 miles, the majority was interstate highways and for half the trip we had a tail wind. After we got home and filled tank I determined we averaged 24 miles per gallon. Previously we got anywhere from 22 MPG to 24 MPG. Hard to tell if I have any more power.
July 15, 2015