This is a good fuel injection cleaner. No complaints.

Pleasantly surprised. Used one treatment, and thus far it has worked decently. I only used about 1/3rd with 1/4 tank of gas. Drove about 40 miles after and then waited the following day to do a cold start-up again. I immediately noticed that my "mild" out of sync rhythm was smoother ! Now the engine idle rhythm is more consistent - as I think it should for a 12 y/o car. My 2000 civic for years had a strange out-of-sync idle and I was not able to get rid of it with other products. It was similar to a mild misfire. I checked for codes but found none (for years). I tried a lot of products and nothing seemed to smooth out that issue as much. I bought this product very cheap compared to several other products on my local auto parts store.

I am surprised and pleased to some extent. For that price, it was worth it. I still have some in the bottle left over for a second treatment.

Please note that I used more than the recommended amount. With any luck it might just clear up even more. Definitely would buy again. Great product !! I will update in coming months to see if engine is still going ok.

June 2016 Update: After a few plug changes I noticed that the plug tips are extremely white (like it was bleached). Very impressed. I
just hope it does not damage the fuel pump. Thats really strong stuff.....