BG 44K Fuel System Cleaner Power Enhancer 11oz.

BG 44K works! I have a 2016 Subaru STI with 60,000 miles and modifications (go figure) that makes 310 WHP. Not crazy because I'm not trying to blow the block.Lately, I have had some rough idle issues, specifically misfires in cylinder #4. The misfire counts were low with no more than 5 and average of 1 or 2. I put this product in my tank, filled it up with Costco gas, and drove like normal. It has been 1.5 weeks and a half tank since. The misfires at idle are gone.For supporting data, I referenced my Injector Duty Cycle. When the misfires were happening (before adding BG 44K) when idle the injectors operated at 0.96% and after the half tank, they were at 0.90%. Also, the Air-Fuel Ratio is more consistently hitting a 14.7-14.8, before it was 14.9-15.1. The fuel system flows better through the injectors and more efficiently.*Data collected at idle ~750 rpm with no accessory loads.***I cannot speak accurately about any change in fuel milage as I have not driven far enough to collect that data. And traffic is unpredictable. Although, some of the reviews claim better milage.**Cost: BG 44K is on the high side of fuel treatments on the market. I have used others like STP and never felt like it did anything to truly clean the fuel system. I recommend using it every 30,000 miles. Anymore and it is a waste. Unless you are the kind of person that races to work in ten minutes to not be late, on an empty tank, you will be fine with longer use intervals. But that's another issue entirely.Location: Pacific Northwest. Ethanol in the pump gas can range from 8% to 12%. Not the most ideal but what can you do?Background: I am a technician. No, I am not promoting this product. A dealership I worked for did use BG products and I did notice differences in vehicle performance when conducting services with BG products. Most notable was the gear oil treatment on manual transmissions. The Direct Inject engines take the fuel system cleaners well. If you are having carbon build-up issues check it out. It has been difficult to find a BG dealer where I located and was surprised to see them on Amazon.

First, I would like to start off by addressing ALL AUDI OWNERS who are dealing with the common Carbon Buiid up, random misfiring codes and or rough cold starts. THIS S@!? WORKS!!I was hopeful that this stuff would work, or at the very least, make somewhat of a difference. I have to admit that this fuel system cleaner, really is magic in a bottle. My car no longer has rough cold start and throws out random misfiring codes.This product seemed to open clogged areas within my engine and literally feels like the car is 9 times more responssive and has a much much aggressive growl to my afternarket exhaust. I ran a bottle through a half of tank and went out on a 100mile ride. At 50 miles, I reached my destination, had dinner, and turned around. On my route back home? was when I noticed the car was so much more responsive. Of course I ran out of gas before I made it home, but at this point I was still not sure if it was just all in my head, the next day was sure to be a game changer.I starting the car and witness no crazy rough start and had a super smooth idling down from 1800 rpm's to 500 rpms with no CEL displaying. I tripled check Vag com and guess what? No misfiring codes either. I ordered 3 more bottles the very same minute while sitting in the car.Whatever this stuff is? seems to work on my carbon built up misfiring codes. I'm not sure if I'm suppose to run mutible bottles back to back, but I am running a second bottle (a week later) on a full tank. I typically never ride 100 miles and live in the city. So, this second bottle will be on a full tank. This will be running through my day to day usage in the city.A mechanic wanted 500$ for the labor to clean out the carbon build up. 500$ was a great deal, but the parts needed? Was seriously over the top. 1400$ in parts included new injectors, spark plugs, oil, gaskets and injector seal kit. Apparently a carbon clean is "pointless" without new injectors. Smh... Either way, this stuff saved a lot of money and I hope to continue to see results well after, just like the rest of the buyers on here.I hope this stuff works for you and that this message was helpful.