Using in a 2025 Sierra 1500 AT4X with the baby Duramax. Don’t have enough miles to give mpg effect but can absolutely state using Amsoil All in One has resulted in a much smoother running engine. Have also noted the consumption rate for DEF has dropped significantly. That in and of itself helps justify the cost of this additive. Highly recommend!
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Best all in one diesel additive!
By 
GREGORY, 
a 
Verified Buyer 
from 
Washington State  
on 
February 01, 2025
My Cummins gained about 3 mpg. Love this stuff to keep the injectors clean and boost my fuel.
Bottom Line
Yes, I would recommend this to a friend.
Was this review helpful?
5 star rating
Use in Winter
By 
FRANK, 
a 
Verified Buyer 
on 
January 31, 2025
Use this product in winter. Been -25c and truck has no problems starting and or running
We’ve had very cold weather. Coldest was -13. I have had no issues with starting and changed my fuel filter yesterday with no signs of gelling with my 2024 gmc with 15000 miles with a 3.0 duramax
By 
BRUCE R., 
a 
Verified Buyer 
from 
Idaho 
on 
December 17, 2024
I have had good results with All in one diesel fuel additive. We tend to have cold wet winters in rural north Idaho. I don't know what additives are in the fuel at the pump. I run all in one and have had good results. ULSD in this country is alleged to lack lubricity. Emmissions add to the complications and injector pump failure is not unheard of. The fuel system is possibly the most expensive system on the truck to repair/replace. It's easy to order and delivery is lightening fast. I am a satisfied customer. Thank You.
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.
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