I always used Howes meaner cleaner (that stuff is awesome), this stuff made my Cummins ever quieter than the Howe’s and it had the same mileage gain. It’s a little more expensive but the piece of mind that it’s being lubricated to the max is worth it.

I've been using Amsoil products for 23-24 years now and have never had a fuel problem since using the all in one

I have been using this in my Duramax for 4 years now it has proven itself to be a game changer for a diesel. I had a diesel work truck that did not get this treatment and it had all kind of fuel rail and injector issues. No problem at all on my personal diesel. Highly recommend!

I drove about 700 miles and did not see any difference. Maybe my fuel system is too clean being I only have 15000 miles since new.

Works as stated!

have used this in my f350 SD since new. love it

It works like it post to ran it in my other truck had 192000. Miles with no issues related to fuel

All-in-One reduces smoke at start up.

I firmly believe todays diesel fuel does not have the lubrication needed for the diesel high pressure fuel pumps. as to why we see catastrophic failure of the HPFP's.

Simple stuff to use - I pour in a bottle quarterly and get fantastic oil analysis reports every year. Cheap insurance for sure.

It works like it’s supposed to for the cp4 pumps

Here is an excellent all in one diesel fuel treatment. I use one bottle at evert fill up. I have used a few different brands of treatment and I must say, this is by far the best one . First, it’s nice that the bottle is designed to fit any size fuel spout. It’s slender neck makes it easy to pour into the tank. I don’t have a cap less fuel tank on my truck, but it would work and it works without needing a funnel. I use Amsoil upper cylinder cleaner in my other cars and one doesn’t have a fuel cap and it does a great job without spilling a drop. Secondly, I do see a slight increase in mpg. I’ve seen an increase of about 2-3. With other products,, I’ve seen some mpg improvement , but not much to really notice. Thirdly, my engine seems to take this all in one very well. It hasn’t hesitated at start ups or has any discolored smoke or anything. The engine appears to accept the treatment just fine. I like that it is all in one and that I do not need to add any additional detergents. I have used it during the winter, as well as this summer and like I said, I’ve had zero problems. It cleans injectors as well as increased lubricity. It helps with anti gelling during the cold months . I originally purchased them one at a time for the first month from a local dealer, but I have since bought them in cases of six, for easier ordering. Sometimes it’s more challenging to get one or two bottles from a local dealer, than to just purchase from Amsoil. I am very pleased with using the all in one and I would highly recommend this to any and every diesel engine owner. Such a small price to pay, to keep your engine healthy. Don’t hesitate and use any other brand. Amsoil is the best out there and very reasonably priced. ($34 box of 6). Not bad. Wonderful product, by a wonderful company.

of the amsoil additives I have used, I believe this one is the best. I have had no injector problems and it feels like there is an increase in power and a mileage increase.

This product has helped from freeze ups, from the past when using the other products .

use amsoil for all your equipment don't risk it with cheap oils.

I’ll let you know after 200k miles!!

The product seems to work well. Recently used it on a 5000 mile trip. I'm not happy with the way Amsoil has reduced the size of the bottle by half. They have also removed the sight strip in the bottle that was useful for smaller doses when toping off my tanks. I have placed 2 orders in the past few months, both over 100 dollars. I did not receive my free promotional items.

Drive a 2010 ZDX: when running King Soops premium, the car pings. Put this stuff in, and no pings. Gotta dig that.

I've been using in my new 3.0 eco diesel from the beginning bc the present leaders are trying to kill the diesel engine with their regulations on lubricity in diesel fuel. Use it regularly to keep your high pressure fuel pump lubricated.

I always use diesel all in one every time I full up my RAM 3500 because you never know how dirty the fuel is coming from the pump and knowing Amsoil test all there products to exceed all standards and keep my engine running for years to come.