Customer Ratings & Reviews

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.

Did not really notice any difference, was hoping to at least see a1 to 2 mile per gallon increase in fuel mileage.

More power, response and money saved on fuel economy!

Simply put - the best diesel additive available.

Simply put - this is the best all-weather product available for all your diesel powered machines.

Big Bird, the ford tractor, loves this stuff. It's really running great w/o any black smoke. Lots of power and only gray smoke.

Great product. As usual, AMSOIL has produced an amazing product. I have seen improved mpg. It’s a slight improvement, but none the less. I went from 11.5 to 13 mpg. My engine sounds solid. It runs great. Seems to be a happy truck. I do like the long skinny necks on the bottles. This makes for an easy pour into the fuel tank. The size is perfect for storing a couple bottles behind the rear seats.

Noticed a significant change in engine idle, was much steadier after just one dose.

I’m impressed with the boost in MPG and performance as it’s a difference that is apparent.

I always thought these additives are most likely beneficial, what I didn't think is it would make a noticable change. Ran one bottle and noticed smother idle and snappier acceleration from a stop. 05 dodge ram Cummins, 170,000 miles

It has help my fuel economy and I don’t worry about my fuel gelling up or clouding over