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AMSOIL Diesel 4-IN-1 Fuel Additive
Product code : ADBCNC-EA
AMSOIL Diesel 4-IN-1 Fuel Additive
Product code : ADBCNC-EA
Current price:
$19.99
Retail Price (CAD)
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- One ounce treats up to 2.5 gallons of fuel
- Combines the benefits of AMSOIL Diesel Injector Clean, Diesel Cold Flow and Diesel Cetane Boost in one convenient package
- Delivers outstanding detergency, improved lubricity, better cold flow and higher cetane
- Provides excellent all-season protection and performance
- Provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.1
*All trademarked names are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.
1Fuels tested in 2017. -
We offer easy returns for customers. If your product is unused and unopened, you may return it within 30 days for a full refund of the purchase price. View full AMSOIL Return Policy.
-
We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.
About this item
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Specially engineered to provide exceptional all-season protection for a serious performance boost. One dose delivers outstanding detergency, improved lubricity, better cold flow and higher cetane.
See the product data sheet for full details.
CLEANS, PROTECTS AND RESTORES POWER
- Cleans dirty injectors
- Restores power and torque
- Reduces smoke and emissions
- Combats fuel-system corrosion
- Provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.1
1Fuels tested in 2017.
AMSOIL Increases Lubricity
Testing reveals AMSOIL Diesel 4-IN-1 provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.OO
![AMSOIL Increases Lubricity – Testing reveals AMSOIL Diesel All-In-One provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.]( "AMSOIL Increases Lubricity – Testing reveals AMSOIL Diesel All-In-One provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.")
OOFuels tested in 2017.
SUPERIOR COLD-TEMPERATURE PROTECTION
- Lowers cold filter-plugging point (CFPP) by up to 40°F (22°C)
- Enhances engine reliability in cold temperatures
- Improves low-temperature startability
- Prevents wax settling during storage
IMPROVES FUEL QUALITY
- Increases cetane up to 4 points
- Delivers maximum horsepower
- Increases fuel economy up to 8%
- Improves startability
- Smooths idle
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star rating
New to the productBy Joe, a Verified Buyer from Gardnerville NV on March 05, 2026Just starting using Amsoil 4-1 Diesel fuel treatment based on social media recommendations. Have gone through 3 tanks, every other fill up, and seems my Cummings 6.7 gen-4 with 120k is running a little smoother. However no news is good news in this case.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
WorksBy TODD, a Verified Buyer on March 02, 2026Product works as shouldBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Winter use of 4 in 1By JOE, a Verified Buyer from Up Nort on February 18, 2026Great product! Noticed better cold starts, fuel economy, and power.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
All in One!By CCMDawg, a Verified Buyer from Arizona on February 12, 2026This is a great all in one product. One bottle works for all my needs including the annual trip to Wyoming in freezing climate.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Low cost investmentBy NICK, a Verified Buyer from Erin Ontario on February 05, 2026My truck got some bad fuel (water) and my injectors suffered, I kept using this 4in1 to help lubricate the pump and injectors in hopes of extending their life, was constant injector performance faults. Took about 1 month of continuous use but the faults are gone. I also started to use this product on all my construction machines, especially like that it has the anti gel additive, it’s helped me a few times.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Works GreatBy REX, a Verified Buyer from NE Montana on January 22, 2026I have only used a single bottle so far. However, having said that it works. I live in a very cold climate and it is doing its job.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great productBy QUENTIN, a Verified Buyer from Kansas on January 16, 2026Great product I fill like my truck runs better on this and I don’t have to worry about the fuel gelling on me.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
MaintainsBy EDWARD, a Verified Buyer from Kennewick on January 16, 2026Never have had any problems with injectors clogging up. Can rely on consistent power.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Worked at -20 FBy Gus, a Verified Buyer from Wisconsin on January 12, 2026Four stars only because I wasn't able to rate it any lower than -20 degrees Fahrenheit. Diesel was unblended #2 with a sudden cold snap arriving and used the additive without starting or running issues on a ungaraged diesel over a three day period.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Cold startsBy DELBERT, a Verified Buyer from Kentucky on January 11, 2026The cold starts fuel additive works well i use it in my 2021 gladiator, 2001 dually duramax and my farm tractor it helps all 3 of them in the cold weather i highly recommend this product.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Data Bulletins-
- One ounce treats up to 2.5 gallons of fuel
- Combines the benefits of AMSOIL Diesel Injector Clean, Diesel Cold Flow and Diesel Cetane Boost in one convenient package
- Delivers outstanding detergency, improved lubricity, better cold flow and higher cetane
- Provides excellent all-season protection and performance
- Provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.1
*All trademarked names are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.
1Fuels tested in 2017. -
We offer easy returns for customers. If your product is unused and unopened, you may return it within 30 days for a full refund of the purchase price. View full AMSOIL Return Policy.
-
We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.
-
Specially engineered to provide exceptional all-season protection for a serious performance boost. One dose delivers outstanding detergency, improved lubricity, better cold flow and higher cetane.
See the product data sheet for full details.
CLEANS, PROTECTS AND RESTORES POWER
- Cleans dirty injectors
- Restores power and torque
- Reduces smoke and emissions
- Combats fuel-system corrosion
- Provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.1
1Fuels tested in 2017.
AMSOIL Increases Lubricity
Testing reveals AMSOIL Diesel 4-IN-1 provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.OO
![AMSOIL Increases Lubricity – Testing reveals AMSOIL Diesel All-In-One provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.]( "AMSOIL Increases Lubricity – Testing reveals AMSOIL Diesel All-In-One provides significant lubricity improvement in diesel fuels found across the U.S., delivering improved wear protection.")
OOFuels tested in 2017.
SUPERIOR COLD-TEMPERATURE PROTECTION
- Lowers cold filter-plugging point (CFPP) by up to 40°F (22°C)
- Enhances engine reliability in cold temperatures
- Improves low-temperature startability
- Prevents wax settling during storage
IMPROVES FUEL QUALITY
- Increases cetane up to 4 points
- Delivers maximum horsepower
- Increases fuel economy up to 8%
- Improves startability
- Smooths idle
-
-
-
star rating
New to the productBy Joe, a Verified Buyer from Gardnerville NV on March 05, 2026Just starting using Amsoil 4-1 Diesel fuel treatment based on social media recommendations. Have gone through 3 tanks, every other fill up, and seems my Cummings 6.7 gen-4 with 120k is running a little smoother. However no news is good news in this case.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
WorksBy TODD, a Verified Buyer on March 02, 2026Product works as shouldBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Winter use of 4 in 1By JOE, a Verified Buyer from Up Nort on February 18, 2026Great product! Noticed better cold starts, fuel economy, and power.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
All in One!By CCMDawg, a Verified Buyer from Arizona on February 12, 2026This is a great all in one product. One bottle works for all my needs including the annual trip to Wyoming in freezing climate.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Low cost investmentBy NICK, a Verified Buyer from Erin Ontario on February 05, 2026My truck got some bad fuel (water) and my injectors suffered, I kept using this 4in1 to help lubricate the pump and injectors in hopes of extending their life, was constant injector performance faults. Took about 1 month of continuous use but the faults are gone. I also started to use this product on all my construction machines, especially like that it has the anti gel additive, it’s helped me a few times.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Works GreatBy REX, a Verified Buyer from NE Montana on January 22, 2026I have only used a single bottle so far. However, having said that it works. I live in a very cold climate and it is doing its job.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great productBy QUENTIN, a Verified Buyer from Kansas on January 16, 2026Great product I fill like my truck runs better on this and I don’t have to worry about the fuel gelling on me.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
MaintainsBy EDWARD, a Verified Buyer from Kennewick on January 16, 2026Never have had any problems with injectors clogging up. Can rely on consistent power.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Worked at -20 FBy Gus, a Verified Buyer from Wisconsin on January 12, 2026Four stars only because I wasn't able to rate it any lower than -20 degrees Fahrenheit. Diesel was unblended #2 with a sudden cold snap arriving and used the additive without starting or running issues on a ungaraged diesel over a three day period.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Cold startsBy DELBERT, a Verified Buyer from Kentucky on January 11, 2026The cold starts fuel additive works well i use it in my 2021 gladiator, 2001 dually duramax and my farm tractor it helps all 3 of them in the cold weather i highly recommend this product.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
