Diesel Defender

Diesel Defender 100% guaranteed

Diesel Defender

Diesel Fuel Lubricator & Injector Cleaner with Advanced IDX4 Detergent

When you need the best defense against low lubricity and harmful deposits, turn to Howes Diesel Defender for maximum lubrication and superior cleaning. Packing 2.5 times more lubricity than most competing products, Defender protects and extends the life of your system. Defender’s state-of-the-art IDX4 Detergent both cleans and prevents all deposits, including Internal Diesel Injector Deposits (IDID), from forming on your injectors. Additionally, this alcohol-free injector cleaner safely removes water, leaving only pure fuel to burn. Diesel Defender also guarantees a minimum 5% increase in your fuel economy. There’s nothing better than a product guaranteed to save you money!

Available sizes:

32 oz 64 oz

WARNING: Cancer - www.P65Warnings.ca.gov



Adds Up To 2.5x More Lubricity

When compared to Howes Meaner Power Kleaner, making it the #1 choice for heavy duty vehicles.


Guaranteed Minimum 5% Improvement In Fuel Economy

When used as a year round solution to lower lubricity and harmful deposits, Diesel Defender provides unmatched performance and guarantees a 5% increase in fuel economy.


Cleans Fuel Injectors

Howes Diesel Defender uses its superior IDX4® detergent, a powerful detergent, to provide maximum cleaning power. IDX4® cleans the toughest deposits from your injectors and keeps them clean, improving performance and fuel economy. When used as directed, Diesel Defender reduces emissions by providing more complete fuel combustion, reducing the need for Cetane improvers.


Removes Water

Many products emulsify or disperse water and frequently use alcohols or solvents that can do damage to your engine. Diesel Defender is a premium, petroleum based product that demulsifies water, safely removing it from diesel fuel.

Other Features Include
  • Provides maximum lubricity in injectors, pumps and upper cylinders
  • IDX4® Detergent cleans all types of injector deposits including Internal Diesel Injector Deposits (IDID) and prevents future deposits
  • Safely removes water, eliminating the environment that promotes microbial growth.
  • Guarantees a minimum 5% increase in fuel economy
  • Reduces exhaust emissions and boosts engine performance and power
  • Warranty safe and effective in all diesel and biodiesel fuels including home heating oil
  • Contains no alcohol or harmful solvents


Truck HD Trucks

Tractor Tractors

Construction Construction


Home Home Heating Oil

Treatment Ratios

Part # Size Treat Rate
103022 1 quart 1 quart to 160 gal.
103020 1/2 gal. 1/2 gal to 320 gal.



Whether you’re a heavy-duty driver, owner of a big ol’ pickup truck, or someone who takes your family on country-wide RV trips, you’re likely familiar with diesel fuel and its benefits over gasoline. Diesel engines are more efficient than gas engines and last much longer than their gasoline counterparts, making them ideal for larger trucks and equipment. When you’re hauling with an 18-wheeler or pushing through the waves with your boat on the weekends, you’re going to be looking for power. Diesel fuel offers you just that.

Perhaps one of the few downsides of diesel engines is how expensive they can be to repair. They have intricate fuel pumps that are prone to harmful injector deposits. Today’s Ultra Low Sulfur Diesel Fuel (ULSD) is severely lacking in lubricity, which can lead to the premature wear of injectors, pumps, and upper cylinders. Luckily, there are ways to protect and extend the life of your diesel engine. One of the easiest ways is using a quality fuel additive.


  • Why Does Lubrication Matter?

    Lubricity is the measure of the reduction in friction and wear by a lubricant. Today’s ULSD fuel lacks vital lubricity. Low lubricity can lead to premature wear of injectors, pumps, and upper cylinders. These moving parts work together to circulate fuel around your engine as well as ignite the fuel to power your vehicle. Excess friction can cause damage to these parts which can lead to loss in fuel economy, expensive repairs, and unwanted downtime. Ultimately, low lubricity leads to a slow or poorly-working engine regardless of outdoor temperature. Diesel Defender provides maximum lubricity to your fuel. It contains 2.5x the amount of lubricity of any other Howes product and many others on the market. Defender helps to protect your system and provides superior power and performance.

  • Why do I need IDX4 Detergent?

    IDX4 Detergent is the strongest, state-of-the-art detergent package in the industry. High Pressure Common Rail (HPCR) systems are prone to Internal Diesel Injector Deposits (IDID) no matter the weather. Deposits can form on your injectors and cause coking and other damage. Uneven injector fuel spray patterns can lead to excess unburned fuel, which costs you precious fuel economy. IDX4 Detergent is formulated to rapidly remove IDID as well as all other carbon deposits, to keep the diesel fuel system clean and performing optimally. It is designed to clean the entire fuel system within three treatments at specified dosages. IDX4 Detergent not only cleans up stubborn deposits, but also prevents them from returning.

  • Is Water in Fuel Always Harmful?

    Yes. Water is detrimental to fuel and your engine at all times of the year. You may be using Diesel Treat anti-gel during the winter to safely remove water to prevent fuel filter icing. But icing is not the only problem water can cause. Water is always corrosive to your entire system and can even cause the destruction of injector tips. Especially during warmer weather, water helps create the perfect environment for microbial growth. It is both timely and expensive to remove algae and bacteria once it has developed in your system. Removing water from your system helps protect and prolong the life of your engine. Alcohol-free Diesel Defender safely removes water by demulsifying or pushing it out of your fuel, leaving only pure fuel to burn. According to major engine manufacturers, demulsification is the preferred method to remove water molecules from diesel fuel. Diesel Defender protects your diesel all year long. You can trust Diesel Defender to keep your system clean and efficient in the short term while prolonging the life of your engine in the long term.


Do you have more questions about diesel fuel? If you’re just getting started with a diesel engine or choosing which products you may need for your diesel vehicles, boats, or equipment, please get in touch with us today! At Howes Products, we pride ourselves on offering you the highest quality products and outstanding customer service. Contact us anytime for more information.



Video Highlight

DIESEL DEFENDER - Maximum Lubrication & Superior Cleaning for Unrivaled Performance.

Fuel Savings Calculator

Diesel Defender (64 oz. Bottle) suggested retail
Total treatment cost
Total Saving from 5% gain in fuel economy


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Howes offers a complete line of additives and lubricants designed to keep you on the road.