Recently I just drove to Wyoming from Arizona and back on a hunting trip. I've made this trip several times in the past. The trip varies in elevation from 4500 up to 11,000 ft. On this trip I started using the Diesel All-In-One and I saw significant increases in power and fuel economy, especially in the higher elevations where my truck used to struggle a bit. Great product and works as advertised!!!

Little bit more mpg and piece of mind the injectors will last longer.

To early to tell. We’ll see.

... All-In-One gets ‘er done. One product, that keeps my diesel engines running great all year. I just trust Amsoil so I don't mess around with other additives any longer.

I only use the highest quality parts and fluids on my 2018 cummins. Amsoil is the best on the market! WORTH EVERY PENNY! Keep your lubricated parts the best they can be! From fuel additives too rear-end lube / front to back! Amsoil all the way. You won't be disappointed, LONG LIVE YOUR DIESEL!!!

Seems cleaner smoke not as black

This is by far the best diesel additive on the market. Thank you, Amsoil!

I only use our 2014 RAM 3500 with a 6.7 Ltr. engine, to tow our fifth wheel RV. Keeping the engine clean is a must and so far, I get 12-14 MPG towing in 5th gear and on the open road empty, I get 29-31 MPG (with a 3.73/1 gear ratio. I couldn't get that without the injectors working really well. I only have 40K on the odometer but I'm still happy putting the fuel additive into the fuel every 4K miles.

Since I started using Diesel All-in-One, my trucks and tractors start easier, smoke less under load and my fuel mileage/ horsepower has increased also.

Tractor fires up just as easy in the winter as it does in the summer! No worries about gelled fuel.

This all-in-one is my go to for my Cummins engine. It keeps it in optimal conditions and I trust Amsoil with my investments!

Helped increase mpg by 1 mpg.

Like this additive

I've been using AMSOIL in my GMC Duramax for 15 years now and still have the original injectors. No problems with the engine and great mileage compared to most that I know. If you want to increase the reliability and longevity of your diesel truck or car, use this awesome product, seriously.

Simple works great. Worth every penny. Definitely recommend.

2020 Ford F350,.....pushed me out to getting 22.7 mpg highway @ avg. 70 mph

The ALL IN ONE Diesel additive helps the fuel filters to last longer and makes a faster and easier engine start.

I've been using All In One in my diesel powered 2020 GMC Sierra pickup. When I started using it I gained about 4 MPG in fuel efficiency. The driving conditions before and after were the same, so I have to credit the improvement to All In One. Also, last winter I spent some time in the north woods with temps hovering about -25F. No jelling. The truck ran fine all winter. I don't know if I would have had problems without All In One, but I wasn't about to take the chance. I recommend to anyone running a diesel powered truck to routinely use All In One.

Use in my 2001 F350 7.3L Turbo dually crew cab. Had problem with injectors missing because of ULS fuel. Tried other products but this works better and faster than all the others. Made me a believer in Amsoil products.

Helps press regulater work better