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

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.

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.

During use CEL may come on which is to be expected and is mentioned on instructions It did function as advertised and there is real improvement in engine idle and response However after 1 week all 4 Up y down stream O2 sensors are either flat line or slow response on diagnosis analysis with computer. No CEL Engine 2015 with 108K miles Silverado 4.3 V6 It is not certain these were failing before using product. It is certain there would be other post , this coild be coincidental. Otherwise very easy to use this system

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)

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

The product showed up damaged and I was not able to return it. A complete waste of money. I’ve bought this product in the past and it works great, but don’t buy this from Amazon. The head of the unit was off the can, and the plastic piece that product comes out of the can from was pushed into the can. There was no way to jimmy rig this like other users did. I left a message with the manufacturer, but never heard back. In the past, I bought this from AutoZone and had better luck. Also, it was cheaper at Autozone.

I recently used this product on my 2019 Hyundai Santa Fe with 52000 miles on it. I never took a look inside of the valves of this GDI engine however, it appears that a GDI service is required every so often on this type of engine. The process was very easy and I took the car after using the product to the shop for an oil change as recommended on YouTube. The car felt more responsive on acceleration and it seems like the MPG has gotten better. Overall highly recommend this product.

I used this product on my Toyota van. I thought this would be better than just running fuel system cleaner or another like product. The gizmo is easy to use and basically replicates what the dealership charges 120-150 dollars for. However, result for me was not very impressive. I manually cleaned the throttle body and used a can of seafoam later with far greater effect on overall performance.