Berryman Products2611 Intake Valve and Combustion Chamber Cleaner, 16-Ounce Aerosol

I have a 2016 Mazda CX-5 with a 2.0 SkyActiv-G engine, which uses GDI technology. I currently have a little bit over 138,000 miles. My engine runs fine, but I figured it couldn’t hurt to clean the valves just in case it was gunked up.Instructions are clear and everything is provided in the package. It took approximately 10 minutes of idling to empty the can.After letting it sit for 30 minutes, I went for a drive. Engine ran fine until I decided to floor it on the highway. It stumbled, threw a code, and went into limp mode.The code was for a rich fuel mixture. I suspect some of the product had pooled in the intake manifold, and once I floored it, an excess amount was ingested, causing an overly rich air/fuel mixture. I advise everyone to NOT use full throttle acceleration in order to mitigate the risk of flooding the engine, or worse, hydrolock.Just take it easy and cruise around town. The package recommends 10 minutes of driving post treatment. I’d say go for 30 minutes just to be sure. In fact, I could smell the burn off from the exhaust while driving around town. No white smoke though.The next day I took the car out for some errands and immediately noticed that the engine sounded a little bit different. It felt more responsive, sharper. I would have to remove the intake manifold to confirm the results, but for now, it seems to have had a positive effect.

This product is freakin amazing. Ignore the negative reviews, those are people who have no clue. I ran one can through my 2012 Jeep Liberty V6 that was getting 12-16MPG and had poor pedal response and no acceleration. I had put plugs and wires, air filter because we just bought it for my daughter and it had 118k miles on it. We took compression test and it was fine. Narrowed it down to possible carbon buildup. Well CARBON BUILDUP INDEED! This thing smoked during the entire can during idle and almost none when driving. Immediate increase in acceleration. Fuel mileage restored to 15-19MPG, which for 118k miles is good enough! I felt the car had more to give so today (a week after the first can) I ran a second can through. This time it did not smoke during idle, but on the road test it burped quite a bit of smoke and the check engine lite came on and went off. no big deal. I was right, she did have more to give! I got MORE acceleration the 2nd time! At the time of writing this, I did not have the mileage into it to retest the MPG, but I will this weekend. I suspect 16-20MPG now. FREAKIN AMAZING STUFF for under $40! NO brainer!I also ran a can through my son's 2014 Chevy Sonic 4cyl (68k miles) and it did not smoke at idle. During the road test, It was sputtering badly to the point I had to use manual shift to rev up the RPM's. Check engine lite blinking. I stopped, let the engine recover and pulled out onto the main road. It started to accelerate and then almost died. I lost all power momentarily. Then this Hiroshima cloud came out the tailpipe, HOLY CRAP WAS THAT A MASSIVE DENSE CLOUD! Afte that, it cleared up and once again, we got the same results, much better acceleration and a 2.4MPG increase, it now gets 29MPG city! (prior was 26.6MPG).I ordered 2 more cans to run through my 2012 Silverado with 788K and my wife's 2017 wrangler with 50k.These cans are worth the investment, you immediately get it back and then some in recaptured MPG, let alone the better performance factor.

I liked the total kit, great way to meter flow. I used the blue cone and just pulled out a vacuum line that seemed ideally positioned at the mid point of my Audi A4 intake manifold (metal flex fuel manifold on a 2013 A4). Used the smaller flow restrictor. Engine vacuum kept the fitting sucked up to the port on the manifold. I also later used this adapter from the kit to spray some CRC intake valve cleaner but had to manually spray and release vs this kit where you just let it flow. As for its ability to clean I cannot definitely make any claims, as in my case I first removed the manifold and did a mechanical cleaning since my valves where heavily caked with carbon deposits and I ran this through as a follow up. Anecdotally the engine runs better after all this but not sure it could have done much by itself if I had not already did some manual cleaning by hand. I would say this will be a part of my maintenance moving forward on my vehicles with gdi engines so I don’t have to manually clean valves for a while. As for value, this is really expensive for what it is and my satisfaction is based on the included fittings and ease of use…and that I was able to attach the fitting to the straw on the CRC valve cleaner can and get some more mileage out of the package.