Sea FoamSpray Engine Intake Valve Cleaner, SS14, 14 oz

I'm rewriting this review weeks after my first use of SeaFoam. My first review was about the smoke, the car running smoother, etc, etc... The normal stuff. As of now, this product has done so much for both our cars...I see alot of debate online about its' effectiveness. People either love SeaFoam or consider it "snake oil". They also criticize saying the smoke is actually the product burning off, not carbon. To the smoke part, I say what difference does it make?We have two high-mileage cars. A 2009 Jeep LIberty with 143,000 miles and a 2013 Kia Forte with 94,000. The Jeep has had its' Check Engine light on for almost a year - P0430 code, "Cat Inefficiency, Bank 2." The timing chains and guides have been replaced along with the Thermal Intake Sensor (what Jeep calls the MASS Airflow Sensor), MAP Sensor, and EGR valve. The car has been through alot, running very rich for years as we worked out problems and I lived near the ocean for a long time so I began to accept the Catalytic Coverter was history from abuse and salt. I did run CatAClean through (not cheap), cleared the code repeatedly and the Check Engine light just came back on. I tried Techroline (and others), and SeaFoam in the gas tank, same thing. Two shops handed me $2,200 estimates for an entire Catalytic Converter Y-pipe because the second cat was sure to be next. I've also been told all along that the Jeep's motor looks all carboned up on a scope.I ran this product in the intake, did the whole hot soak and smoke thing, cleared the codes, and the Check Engine light has stayed off for weeks! It never stayed off for more than a day before; returning the moment the car got hot. No more P0430 code for the first time in almost a year and I've driving the hell out of it!!! I wasn't even trying this for this problem, I just wanted the idle to smooth out... this was an unintended consequence and is saving us $2,000 because had the light stayed on, I was going to have to replace the cats just to SMOG It. I couldn't even sell it if I wanted to.Now the KIA... we've had problems with the car pinging LOUD on hard acceleration. I hadn't tried much to remedy it but it was getting very bad. I figured I'd deal with it at the 100K tune up.But because of the experience with the Jeep, I ran this in the KIA's intake and let it hot soak for fifteen minutes - really out of curiosity. When we started it back up, there was no smoke - NONE. For miles nothing and it was still pinging! Then all of a sudden on the freeway accelerating, the car kind of paused for a second (which scared me a little) and suddenly started blowing blue smoke out the back - making it difficult to even see the car behind. It gradually recovered and the pinging was completely gone. It idles so quiet now I have to keep checking it is actually running.Just like everyone, I've wasted so much money on miracle cures hoping to luck out. It never happens. Honestly, I've run a lot of regular SeaFoam in the gas tank and it never seemed to do anything. (although I just ran it in the oil and yes it really helped). But this product is really great. Chrysler sells something identical (for $40 a can) and the guys at Valvoline said they have theirs too. It seems safe for the car as long as you keep it away from your MASS Airflow Sensor.I probably won't use it on the Kia again for a very long time but I'm going to incorporate this into my normal 30,000 mile tuneups on the Jeep. I think many of the people who consider this "snake oil" are people who had more serious issues the than product could help with, or never had any problems at all and expected there to be something spectacular. What I've seen are very real, tangible, quantifiable results and a major repair bill narrowly avoided.

I was skeptical about trying it but after all the great reviews I had to try it and boy I’m glad I did. Got this because I had a po420 code on my 20 year old van. It’s a beater and I’m not trying to buy cats for it just to pass state inspection. Just like the youtube guys did I sprayed this into the o2 sensor hole. Won’t get into the story about removing it but it was rough. Anyway sprayed the Seafoam in there and let it sit for a few hours. Half of it ended up on the driveway because of a rotted section of exhaust but whatever. Started it up and it smoked like crazy for about 15-20 minutes. Looked like them LA takeovers on my block lol. As soon as I drove it I could immediately notice a difference. Wasn’t the dog it’s been last few years. I’ve filled up with 2 tanks of gas so far and the light hasn’t come back on yet. This is even with half the can ending up on the driveway! My son’s car now has the code so I’ll be doing this on his car next. Absolutely great product I tell everyone that has an old beater with the light on to try this. What do you got to loose?

Items came quick. Works as it should. Packed safely in package. Is bigger than i had thought but it works out perfectly. Will surely buy more

Does what its supposed too, Cleans the upper engine parts.Will likely throw a engine code, as it did for me about half way through.When I was done during the soak I disconnected the battery cable, and the code cleaned, and has not reappeared.

tldr;This stuff works. No more rough idle for my rx8. Be aware your car may smoke for more than anyone online tells you(I was told 10 minutes, and mine smoked for 3 days LMAO). And it will smoke HARD for AT LEAST 10 minutes. It will be hard to see. Do it outside with plenty of ventilation. Follow directions online for YOUR SPECIFIC MAKE AND MODEL! People will point out the smoke, "hey did you know your car is smoking?!" Yes. Yes I know.I daily a Mazda Rx8, the infamous "unreliable" rotary powered Japanese sports car. When I first got the car, it had power issues, and would frequently turn off in the middle of intersections. Took it to the shop, and surprisingly, there were no compression issues. The issue was a failed catalytic converter.Well, after replacing the cat, the thing ran like new. However, there were some rough idles occasionally. After a few hundred miles after the repairs, the idle got worse. I was told by a guy that used to race these things that a failed cat can cause back pressure that can then cause excess carbon buildup. He said to "seafoam it".Following the directions for my specific make and model, it took about 4 hours (only 20 minutes of prep) to let my car soak before starting it up again. Man, DID IT SMOKE!!The car had never been seafoam before, I doubt, so it continued to smoke even after 30 minutes of idling with me revving it to 6k about 20 times, and driving for 15 minutes, hard. I began to panick, however with some research and advice from seafoam themselves, a car may continue to smoke for days of driving, and not to panic.All in all, my car runs amazingly. It feels more responsive, it NEVER idles rough. Highly recommend.

Why did you pick this product vs others?:I've used this in the past and it works well with my vehicle.