My Audi TDI was going into limp mode often. Added a few ounces per instructions and it has been running great since. I repeated the process on the 2nd tank full as well.

I had an EGR light (check engine) for a year , was told I needed to replace it at $3800 . I bottle and 5miles later it was off and never came back on ! 2011 Duramax with 162k .

2012 duramax was getting down to 200 miles between regeneration. 2 bottles later and I'm up to 400, it works! The product may not be long-lasting.

I don’t tend to put much faith in additives like this, but my CEL was on for my turbo vains. This is a costly fix normally. One treatment with a bit of high RPM driving cleared the code and it hasn’t been back since. Ordered more and will continue to use as a preventative

I bought this with the kit oil friction modifier, and the diesel treatment. The 6400 however, saved my '08 F-250 6.4 turbo. I started to get turbo error codes as it was starting to clog up. I was getting bogged down trying to get over 50mph. Turbo PSI would go way to 40 even slowly trying to rev up to 55mph.I only put this in my truck first to see if it would help, drove for a few days and just to be sure took her to the shop. Well by the time the shop looked at it all the error codes cleared…

Outstanding product! I Put 2 bottles in my 2014 Ford F550 with 120k miles before filling up the fuel tank and within 15 miles of driving I noticed the smoother running engine. After driving about 40 miles and average increased about 3 miles per gallon and it felt like driving a brand new truck. Will be using this product regularly to keep the engine components clean.

This product has saved me the cost of taking it to the shop for a replacement DPF unit. Well worth the $25 I paid. That's my feedback.

I use the fuel additive once every other fill-up in my Ford F-250 super duty 4liter and have noticed that my truck has less knocking noise and responds wonderfully upon cold startup.

Very happy with this product. I followed the directions on the bottle and ran an entire tank of diesel on my 2000 Ford F250 and the results were awesome. Less smoke, more miles on the tank and overall smoother running. I will buy this again in a few more months for a long road trip.

I have a Kubota BX25DLB with a small 25 hp 3 cylinder engine. It was starting on one cylinder sputtering and eventually the other two took off but the engine refused to idle at its normal1200 RPM. I put 4 ounces in a 6 gallon tank and worked it for about 2 hours digging out stumps. After two hours the engine idled at 1500 RPM smoothly. I very seldom give a five star as for that rating the item has to be perfect

I have a 97 Dodge ram 2500. It was acting sluggish, and my mileage was starting to drop. I purchased 4 bottles and have used one every few tanks. I truck seems to run smoother and the mileage has come back. I was down to 16 MPG and am now back to 18.5-19 MPG with combine highway and city driving. It works for me.