Customer Ratings & Reviews

I honestly believe that this product has increased the performance of my diesel truck. I would recommend it for anyone who has a diesel truck and wants to increase the performance and efficiency of it.

This is the 3rd diesel truck I have owned over the past 20 years. I started using this oil after being re-introduced to the newer and better way to access getting Amsoil products. I have been a long time fan of Amsoil, as I was in the racing community in the 60's -2000's running USAC several divisions and the NASCAR Modified and Super Modified divisions. I had Amsoil as a sponsor for many years of that time period. I stopped using Amsoil after racing due that it was so difficult in finding someone who sold it and would not want to sell you large quantities, if you wanted to buy if for a normal consumer need. Once I found that I a general consumer was able to purchase it from your website and become a discount customer I was all in. I did this in 2015 and have converted all my vehicles to amsoil products. I use the Cetane Boost in my vehicle year round, and from late October - Mid March I use the All-In-One to keep the cold weather issues from effecting my ability to operate the truck. It has been great this will be my 8 year 7th winter in Texas and I have had absolutely no problems or even any peculiar situations that may indicate any problems were possible, anytime I have had the All-In-One in my Truck. It is a 2012 Ford F350 6.4 Powerstroke.

Working great

if you’re not adding this additive to your fuel, you’re losing mileage. I had been using Achoil, and this smells just like it. Increase mileage and a clean running engine as a result. Buy it.

Was looking for an all in one that would help clean out the whole system. Thought about Diesel Klein but since my family has been loyal to AMSOIL I figured I’d try it. It was perfect! Using auto agent to monitor specs seen the difference in clogged system and when they became clean.

Product that actually works best fuel economy we have ever gotten.

I have a brand new F350 2024 and with the first tank of fuel from the stealership I was getting 14Mpg. After adding this to the 2nd tank it jumped to 19MPG and the truck really did seem to run smoother. I have been using this stuff for years in my Kubotas but honestly you can't tell in them other than I have never had any of my cans or tractor's GEL up in the winter and i've added nothing else. It's noticeable in my truck so I will be sticking with it.

Works better than any other product on the market for an older 2001 diesel motor which requires high sulfur fuel.

I use this religiously in my Kubota tractor. In the last 3 winters I've had no issues with fuel even at -15 degrees. It's really an excellent product.

I feel realy confident when I start my truck at minus 30 degrees centigrade

Got to -5° this winter and never so much as a rough start. The lubricant and cetane makes it my go to all year. Awesome product.

Keeps me from having to worry about my Cummins fuel system…

I have used the Amsoil additive and feel that it is a Quality Product. I would recommend it !

Raises mpg on 3.0 and 6.6 truly recommended

The only additive I run, keeps my Cummins running clean and efficient. Worth every penny!

Great fuel conditioner Great Company

Avec le climat changeant du Québec, qui passe de 5 à -20, je ne me soucis plus du niveau du réservoir de mon camion... Il est toujours prêt à travailler même à -30:) En plus il est un peu moins paresseux:)

No gelling/fuel filter plugging on either my 3.0l duramax or my x5 diesel. Will continue using the product 👍

I've been using this in my 2018 6.6L Duramax and my son's 2007 6.6L Duramax (While he's out of the country) since it began with the cold weather, making sure to dump it in just prior to fueling. I've had no issues whatsoever with either truck. I run them both for longer trips at least once a week and mine I run around 'town' all the time. NOTE: This winter has not been particularly cold so it looks like the All-In-One is doing just fine. If the winters get bitterly cold you may have to add some Amsoil Cold Flow to aid in the volume of fuel to cold ratio since the amount of the other additives must take up some room in the 16 oz bottle. I must also say the reverse ounce labeling on the side of the bottle makes it very easy to tell how much you're putting in the tank, well done! On a final note, it is extremely handy to have the four additives "All-In-One!"

Very good product goodbye again