STPPro Series Car Intake Valve Cleaner, Car Cleaner Avoids Engine Teardown and Improves Engine Performance for Cars, Truck, Motorcycle - 20 Oz

Really a great system. Just wish the price was lower or system reusable. Does it work?Who knows? It’s insurance just in case for GTI intake valves.

I have 2015 Kia Forte5 turbo GDI with 72,XXX. I try my best to take care of the GDI as best I can. Couple weeks ago I had used the Chevron/Technron Fuel System Cleaner and it had a negative effect. My car started jerking/hesitating while under load (i.e. full throttle). I thought maybe my fuel pump was giving up the ghost but it cranks just fine. I didn't put two and two together until I thought about what changed recently.I was VERY close to paying a shop to run a fuel injector service but searched amazon, saw the reviews for this and opted to try it. Followed the instructions and immediately I have no more jerking/hesitation at high RPM. My idle also dropped from 900 to about 700.This STP intake cleaner fixed what the Chevron treatment messed and definitely has my GDI engine running more efficiently. I believe in this enough that I will be using on my other car (Mitsubishi Outlander) as part of my routine maintenance regiment. I don't know for sure but I believe this is a similar product/process that repair shops/dealerships use as well.Your mileage may vary (pun intended)

Follow the included instructions and you're good to go. During the cleaning I did notice some white smoke coming out of the exhaust, so I knew it was working. Afterwards you could definitely notice a difference if acceleration and smoothness. Most cleaners are not easily used by a single person. So even though this STP cleaner is little expensive, you get a good product that can be used by an individual. As they say "you get what you pay for".

Easy to use. Not a significant performance increase but gas mileage was better. High compression direct fuel injection engine in my car.

Product timer worked fine but never dispersed any product, could just be old or I don’t know, but it did not work for me..

Best product

I really didn't know about the issue with fuel injected engines getting build up on the intake valves until I stumbled across it on a car forum when I was researching another problem. My car only has about 35K miles on it, but from what I was reading, you can get build up in as little as 10K miles. I was doing some other maintenance anyway, so I thought I would give this a try even though the engine was running fine. I followed the instructions on the can and it worked like a champ. The check engine light came on 2-3 times while it was spraying, but went off after a few seconds. I did a test drive around town after it was done and it seemed to run fine. The next day I went on a road trip of over 300 miles. This trip usually takes about 3/4 of a tank of gas. It only took about 5/8 of a tank. The return trip was even better using barely 1/2 tank. I'm really pleased with those results especially with gas prices the way they are. I plan to use a can of this at every other oil change because it's clearly doing something right.

I used this product on our 2017 GMC Acadia with 120k miles. As other folks have stated, this will make your card mad (i.e. check engine lights) during the process, but in my experience the lights reset themselves at the end of the process.I had a code scanner just in case. I believe this works as advertised, the engine was much quieter after the cleaning and the throttle response improved.