Dee-Zol Concentrate Diesel Treatment - 32 oz. Bottle

I have a car, truck, side-by-side, tractor, and several other small engine diesel pieces of equipment. I use Dee-Zol in all of them. I bought the car and truck used, each had over 250k miles. I see between a 10 to 15 percent increase in fuel economy when I remember to put this in the tank. Of course, I notice when I forget as both vehicles idle a little rougher.The diesel based equipment seems quieter and I have had no issues with water in the system.A+ in my book.

My truck isn't the most efficient so it blew black smoke like crazy when you get on it hard with minimal boost. I've been using 3oz. of this in every single tank and I think it cut my black smoke in half. Now some may say "that's a bad thing" well, I say it's a good thing and I don't think my truck has been happier. I wish I could have taken videos of the cylinders before and after I treated solid until the bottle was gone. I don't think anyone's ever done that... Suggestion: 150,000 mile truck take video or pictures inside the cylinders and of the injector tips. Run this bottle through over the next however many tanks and then re-do the video and pics... I want to see how clean my cylinders and injectors are now. I'm tempted to pull one...

Good product to use. My freightliner was driving rough and engine light came on. I put some of this product in and light came off with the truck driving better. Maybe bad diesel or water in the tank. This product helped.

Works great in my tdi and keeps me running strong. I must admit I use JET-A instead of diesel and this product keeps my engine running smooth and the injectors lubricated well.

does what it said

I liked actually worked. I used it as a diesel addive.

Keeps water from building up in the fuel tank.

Excellent product that works quickly!