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AMSOIL Diesel 4-IN-1 Fuel Additive

Official AMSOIL product image. Packaging may vary.

Before the cold · ADB

AMSOIL Diesel 4-IN-1 Fuel Additive

By Jonathan Lackman, Independent AMSOIL Dealer · Updated

All-season treatment combining injector cleaning, lubricity, cold-flow improvement and cetane enhancement.

  • Helps control injector deposits
  • Helps protect pumps and injectors against wear
  • AMSOIL reports up to 40°F (22°C) CFPP reduction and up to four cetane points
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Dealer link · U.S. & Canadian customers · Price and stock confirmed at AMSOIL.

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Review the product options before deciding. Online catalog requests use my low dealer number, ZO 313120. For a printed copy, email me.

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Choose it for the right jobPrevention, not recovery: will not reverse existing wax crystals or gel. CFPP reduction is not a guaranteed minimum operating temperature.

Use and treatment rate

Add before refueling while fuel is above its cloud point. Maintenance rate: 1 fl oz per 2.5 US gallons; 16 fl oz treats 40 gallons.

Use the current package label and official directions. Rates below are in U.S. gallons; Canadian buyers should follow the metric label.

Package options

8 oz, 16 oz, 64 oz, 5 gallon pail, 55 gallon drum. Availability varies.

Product data sheet ↗Safety Data Sheet ↗
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Your questions, answered.

All-season diesel treatment →4-IN-1 versus Cold Flow →When to add winter treatment →4-IN-1 treatment ratios →Injector protection through winter →

How much do you need?

Choose the product and package chart first. All fuel amounts are per vehicle or tank; the fleet count multiplies the result.

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Choose a combined routine

This is the combined-treatment choice to compare when you want several fuel-care functions in one bottle. Decide whether that convenience fits your normal fill-up routine. Keep an emergency recovery plan separate; purchasing a combined preventive treatment does not eliminate the need to identify an existing fuel-delivery problem.

Compare the alternatives

See the complete additive comparison table to separate anti-gel prevention, recovery and routine fuel care.

Who uses this?

Which diesel treatment do I need?

Answer up to three questions about gelled fuel, cold-weather protection and routine fuel care.

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