I have a 2006 Nissan Murano 3.5 engine with 213000.0 miles that had a rough idle so I tried two other products and notice little difference, I remembered this product from many years ago, purchased 2 cans and added both cans to a full tank gas, it has a 19 gallon tank. After driving the first 100 miles I notice car idling very good and it had a lot more power. I was so impressed the performance, I also added 2 cans to my 2009 Chevy Silverado 5.3 with a 25 gallon tank and 132000.0 miles on that engine and gotten the same results. I can say there is a increase on the car from 18 mpg to 20 mpg on the interstate and my truck also had 2 gallon gain also. I’m very impressed with this product, So I wanted to share this with my family and friends…PS..MLS is a believer…it works… 1-13-21